diff --git a/compiler/ast-passes/src/canonicalization/canonicalizer.rs b/compiler/ast-passes/src/canonicalization/canonicalizer.rs
index 0bec06f5a2..86aa80cbe8 100644
--- a/compiler/ast-passes/src/canonicalization/canonicalizer.rs
+++ b/compiler/ast-passes/src/canonicalization/canonicalizer.rs
@@ -18,6 +18,8 @@
 //! such that it applies changes to the AST nodes for canonicalization.
 //! An example of these changes are transforming Self -> to the circuit name.
 
+use std::cell::RefCell;
+
 use leo_ast::*;
 use leo_errors::{AstError, Result};
 use leo_span::{sym, Span, Symbol};
@@ -104,23 +106,14 @@ impl Canonicalizer {
         }
     }
 
-    fn canonicalize_self_type(&self, type_option: Option<&Type>) -> Option<Type> {
-        match type_option {
-            Some(type_) => match type_ {
-                Type::SelfType => Some(Type::Identifier(self.circuit_name.as_ref().unwrap().clone())),
-                Type::Array(type_, dimensions) => Some(Type::Array(
-                    Box::new(self.canonicalize_self_type(Some(type_)).unwrap()),
-                    dimensions.clone(),
-                )),
-                Type::Tuple(types) => Some(Type::Tuple(
-                    types
-                        .iter()
-                        .map(|type_| self.canonicalize_self_type(Some(type_)).unwrap())
-                        .collect(),
-                )),
-                _ => Some(type_.clone()),
-            },
-            None => None,
+    fn canonicalize_self_type(&self, type_: &Type) -> Type {
+        match type_ {
+            Type::SelfType => Type::Identifier(self.circuit_name.as_ref().unwrap().clone()),
+            Type::Array(type_, dimensions) => {
+                Type::Array(Box::new(self.canonicalize_self_type(type_)), dimensions.clone())
+            }
+            Type::Tuple(types) => Type::Tuple(types.iter().map(|type_| self.canonicalize_self_type(type_)).collect()),
+            _ => type_.clone(),
         }
     }
 
@@ -174,7 +167,7 @@ impl Canonicalizer {
 
             Expression::Cast(cast) => {
                 let inner = Box::new(self.canonicalize_expression(&cast.inner));
-                let target_type = self.canonicalize_self_type(Some(&cast.target_type)).unwrap();
+                let target_type = self.canonicalize_self_type(&cast.target_type);
 
                 return Expression::Cast(CastExpression {
                     inner,
@@ -231,7 +224,7 @@ impl Canonicalizer {
                     AccessExpression::Static(static_access) => AccessExpression::Static(StaticAccess {
                         inner: Box::new(self.canonicalize_expression(&static_access.inner)),
                         name: static_access.name.clone(),
-                        type_: self.canonicalize_self_type(static_access.type_.as_ref()),
+                        type_: RefCell::new(self.canonicalize_self_type(&static_access.type_.borrow())),
                         span: static_access.span.clone(),
                     }),
                 };
@@ -371,7 +364,7 @@ impl Canonicalizer {
             }
             Statement::Definition(definition) => {
                 let value = self.canonicalize_expression(&definition.value);
-                let type_ = self.canonicalize_self_type(Some(&definition.type_)).unwrap();
+                let type_ = self.canonicalize_self_type(&definition.type_);
 
                 Statement::Definition(DefinitionStatement {
                     declaration_type: definition.declaration_type.clone(),
@@ -409,7 +402,7 @@ impl Canonicalizer {
                 })
             }
             Statement::Iteration(iteration) => {
-                let type_ = self.canonicalize_self_type(Some(&iteration.type_)).unwrap();
+                let type_ = self.canonicalize_self_type(&iteration.type_);
                 let start = self.canonicalize_expression(&iteration.start);
                 let stop = self.canonicalize_expression(&iteration.stop);
                 let block = self.canonicalize_block(&iteration.block);
@@ -465,7 +458,7 @@ impl Canonicalizer {
 
     fn canonicalize_function_input(&mut self, input: &FunctionInput) -> FunctionInput {
         if let FunctionInput::Variable(variable) = input {
-            let type_ = self.canonicalize_self_type(Some(&variable.type_)).unwrap();
+            let type_ = self.canonicalize_self_type(&variable.type_);
 
             return FunctionInput::Variable(FunctionInputVariable {
                 identifier: variable.identifier.clone(),
@@ -495,7 +488,7 @@ impl Canonicalizer {
                     .iter()
                     .map(|input| self.canonicalize_function_input(input))
                     .collect();
-                let output = self.canonicalize_self_type(function.output.as_ref());
+                let output = self.canonicalize_self_type(&function.output);
                 let block = self.canonicalize_block(&function.block);
 
                 return CircuitMember::CircuitFunction(Box::new(Function {
@@ -687,20 +680,15 @@ impl ReconstructingReducer for Canonicalizer {
         annotations: IndexMap<Symbol, Annotation>,
         input: Vec<FunctionInput>,
         const_: bool,
-        output: Option<Type>,
+        output: Type,
         block: Block,
     ) -> Result<Function> {
-        let new_output = match output {
-            None => Some(Type::Tuple(vec![])),
-            _ => output,
-        };
-
         Ok(Function {
             identifier,
             annotations,
             input,
             const_,
-            output: new_output,
+            output,
             block,
             core_mapping: function.core_mapping.clone(),
             span: function.span.clone(),
diff --git a/compiler/ast/src/accesses/static_access.rs b/compiler/ast/src/accesses/static_access.rs
index c61d4976f1..5d3455e002 100644
--- a/compiler/ast/src/accesses/static_access.rs
+++ b/compiler/ast/src/accesses/static_access.rs
@@ -19,7 +19,7 @@ use crate::{Expression, Identifier, Node, Type};
 use leo_span::Span;
 
 use serde::{Deserialize, Serialize};
-use std::fmt;
+use std::{cell::RefCell, fmt};
 
 /// An access expression to a static member, e.g., a constant in a circuit.
 /// An example would be `Foo::Const` or `Foo::function` in `Foo::function()`.
@@ -30,9 +30,9 @@ pub struct StaticAccess {
     pub inner: Box<Expression>,
     /// The static member in `inner` that is being accessed.
     pub name: Identifier,
-    /// An optional type initially None, it is later assigned during type inference snapshot if necessary.
+    /// A refcell type initially (), it is later assigned during type checking if necessary.
     // FIXME(Centril): Shouldn't be in an AST. Remove it as part of an architectural revamp.
-    pub type_: Option<Type>,
+    pub type_: RefCell<Type>,
     /// The span for the entire expression `inner::name`.
     pub span: Span,
 }
diff --git a/compiler/ast/src/functions/function.rs b/compiler/ast/src/functions/function.rs
index 11b5686367..92f4bba7d3 100644
--- a/compiler/ast/src/functions/function.rs
+++ b/compiler/ast/src/functions/function.rs
@@ -34,7 +34,7 @@ pub struct Function {
     /// The function returns a constant value.
     pub const_: bool,
     /// The function return type, if explicitly specified, or `()` if not.
-    pub output: Option<Type>,
+    pub output: Type,
     /// Any mapping to the core library.
     /// Always `None` when initially parsed.
     pub core_mapping: Cell<Option<Symbol>>,
@@ -93,12 +93,8 @@ impl Function {
         write!(f, "function {}", self.identifier)?;
 
         let parameters = self.input.iter().map(|x| x.to_string()).collect::<Vec<_>>().join(",");
-        let returns = self.output.as_ref().map(|type_| type_.to_string());
-        if returns.is_none() {
-            write!(f, "({}) {}", parameters, self.block)
-        } else {
-            write!(f, "({}) -> {} {}", parameters, returns.unwrap(), self.block)
-        }
+        let returns = self.output.to_string();
+        write!(f, "({}) -> {} {}", parameters, returns, self.block)
     }
 }
 
diff --git a/compiler/ast/src/reducer/reconstructing_director.rs b/compiler/ast/src/reducer/reconstructing_director.rs
index dac65809bd..cc12423ad6 100644
--- a/compiler/ast/src/reducer/reconstructing_director.rs
+++ b/compiler/ast/src/reducer/reconstructing_director.rs
@@ -182,11 +182,7 @@ impl<R: ReconstructingReducer> ReconstructingDirector<R> {
     pub fn reduce_static_access(&mut self, static_access: &StaticAccess) -> Result<StaticAccess> {
         let value = self.reduce_expression(&static_access.inner)?;
         let name = self.reduce_identifier(&static_access.name)?;
-        let type_ = static_access
-            .type_
-            .as_ref()
-            .map(|type_| self.reduce_type(type_, &static_access.span))
-            .transpose()?;
+        let type_ = self.reduce_type(&static_access.type_.borrow(), &static_access.span)?;
 
         self.reducer.reduce_static_access(static_access, value, type_, name)
     }
@@ -578,11 +574,7 @@ impl<R: ReconstructingReducer> ReconstructingDirector<R> {
             inputs.push(self.reduce_function_input(input)?);
         }
 
-        let output = function
-            .output
-            .as_ref()
-            .map(|type_| self.reduce_type(type_, &function.span))
-            .transpose()?;
+        let output = self.reduce_type(&function.output, &function.span)?;
 
         let block = self.reduce_block(&function.block)?;
 
diff --git a/compiler/ast/src/reducer/reconstructing_reducer.rs b/compiler/ast/src/reducer/reconstructing_reducer.rs
index 4b0b3938d5..7f368c8c4a 100644
--- a/compiler/ast/src/reducer/reconstructing_reducer.rs
+++ b/compiler/ast/src/reducer/reconstructing_reducer.rs
@@ -18,6 +18,8 @@
 //! It implements default methods for each node to be made
 //! given the information of the old node.
 
+use std::cell::RefCell;
+
 use crate::*;
 
 use leo_errors::Result;
@@ -176,13 +178,13 @@ pub trait ReconstructingReducer {
         &mut self,
         static_access: &StaticAccess,
         value: Expression,
-        type_: Option<Type>,
+        type_: Type,
         name: Identifier,
     ) -> Result<StaticAccess> {
         Ok(StaticAccess {
             inner: Box::new(value),
             name,
-            type_,
+            type_: RefCell::new(type_),
             span: static_access.span.clone(),
         })
     }
@@ -472,7 +474,7 @@ pub trait ReconstructingReducer {
         annotations: IndexMap<Symbol, Annotation>,
         input: Vec<FunctionInput>,
         const_: bool,
-        output: Option<Type>,
+        output: Type,
         block: Block,
     ) -> Result<Function> {
         Ok(Function {
diff --git a/compiler/parser/src/parser/expression.rs b/compiler/parser/src/parser/expression.rs
index c78ca3e6e3..3420fd6070 100644
--- a/compiler/parser/src/parser/expression.rs
+++ b/compiler/parser/src/parser/expression.rs
@@ -14,6 +14,8 @@
 // You should have received a copy of the GNU General Public License
 // along with the Leo library. If not, see <https://www.gnu.org/licenses/>.
 
+use std::cell::RefCell;
+
 use super::*;
 
 use leo_errors::{ParserError, Result};
@@ -375,7 +377,7 @@ impl ParserContext<'_> {
                     expr = Expression::Access(AccessExpression::Static(StaticAccess {
                         span: expr.span() + &ident.span,
                         inner: Box::new(expr),
-                        type_: None,
+                        type_: RefCell::new(Type::Tuple(Vec::new())),
                         name: ident,
                     }));
                 }
diff --git a/compiler/parser/src/parser/file.rs b/compiler/parser/src/parser/file.rs
index 6318e66600..1f25449d1a 100644
--- a/compiler/parser/src/parser/file.rs
+++ b/compiler/parser/src/parser/file.rs
@@ -442,9 +442,9 @@ impl ParserContext<'_> {
 
         // Parse return type.
         let output = if self.eat(Token::Arrow).is_some() {
-            Some(self.parse_type()?.0)
+            self.parse_type()?.0
         } else {
-            None
+            Type::Tuple(Vec::new())
         };
 
         // Parse the function body.
diff --git a/tests/expectations/parser/parser/circuits/const_functions.leo.out b/tests/expectations/parser/parser/circuits/const_functions.leo.out
index 0cd2d5e744..0ab3138fdf 100644
--- a/tests/expectations/parser/parser/circuits/const_functions.leo.out
+++ b/tests/expectations/parser/parser/circuits/const_functions.leo.out
@@ -19,7 +19,8 @@ outputs:
               identifier: "{\"name\":\"x\",\"span\":\"{\\\"line_start\\\":5,\\\"line_stop\\\":5,\\\"col_start\\\":20,\\\"col_stop\\\":21,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"    const function x() { \\\"}\"}"
               input: []
               const_: true
-              output: ~
+              output:
+                Tuple: []
               core_mapping: ~
               block:
                 statements:
@@ -61,7 +62,8 @@ outputs:
               input:
                 - SelfKeyword: "{\"name\":\"self\",\"span\":\"{\\\"line_start\\\":8,\\\"line_stop\\\":8,\\\"col_start\\\":22,\\\"col_stop\\\":26,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"    const function x(self) { \\\"}\"}"
               const_: true
-              output: ~
+              output:
+                Tuple: []
               core_mapping: ~
               block:
                 statements:
@@ -103,7 +105,8 @@ outputs:
               input:
                 - ConstSelfKeyword: "{\"name\":\"const self\",\"span\":\"{\\\"line_start\\\":11,\\\"line_stop\\\":11,\\\"col_start\\\":22,\\\"col_stop\\\":32,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"    const function c(const self) { \\\"}\"}"
               const_: true
-              output: ~
+              output:
+                Tuple: []
               core_mapping: ~
               block:
                 statements:
@@ -158,7 +161,8 @@ outputs:
                       path: ""
                       content: "    const function b(const self, x: u32) {"
               const_: true
-              output: ~
+              output:
+                Tuple: []
               core_mapping: ~
               block:
                 statements:
@@ -213,7 +217,8 @@ outputs:
                       path: ""
                       content: "    const function b(const self, const x: u32) {"
               const_: true
-              output: ~
+              output:
+                Tuple: []
               core_mapping: ~
               block:
                 statements:
diff --git a/tests/expectations/parser/parser/circuits/field_and_functions.leo.out b/tests/expectations/parser/parser/circuits/field_and_functions.leo.out
index 92db113716..87fdd6fc9c 100644
--- a/tests/expectations/parser/parser/circuits/field_and_functions.leo.out
+++ b/tests/expectations/parser/parser/circuits/field_and_functions.leo.out
@@ -36,7 +36,8 @@ outputs:
               identifier: "{\"name\":\"x\",\"span\":\"{\\\"line_start\\\":7,\\\"line_stop\\\":7,\\\"col_start\\\":14,\\\"col_stop\\\":15,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"    function x() {\\\"}\"}"
               input: []
               const_: false
-              output: ~
+              output:
+                Tuple: []
               core_mapping: ~
               block:
                 statements:
@@ -77,7 +78,8 @@ outputs:
               identifier: "{\"name\":\"y\",\"span\":\"{\\\"line_start\\\":10,\\\"line_stop\\\":10,\\\"col_start\\\":14,\\\"col_stop\\\":15,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"    function y() {\\\"}\"}"
               input: []
               const_: false
-              output: ~
+              output:
+                Tuple: []
               core_mapping: ~
               block:
                 statements:
diff --git a/tests/expectations/parser/parser/circuits/functions.leo.out b/tests/expectations/parser/parser/circuits/functions.leo.out
index c6db22f69c..418505ce86 100644
--- a/tests/expectations/parser/parser/circuits/functions.leo.out
+++ b/tests/expectations/parser/parser/circuits/functions.leo.out
@@ -16,7 +16,8 @@ outputs:
               identifier: "{\"name\":\"x\",\"span\":\"{\\\"line_start\\\":4,\\\"line_stop\\\":4,\\\"col_start\\\":14,\\\"col_stop\\\":15,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"    function x() {\\\"}\"}"
               input: []
               const_: false
-              output: ~
+              output:
+                Tuple: []
               core_mapping: ~
               block:
                 statements:
@@ -57,7 +58,8 @@ outputs:
               identifier: "{\"name\":\"y\",\"span\":\"{\\\"line_start\\\":7,\\\"line_stop\\\":7,\\\"col_start\\\":14,\\\"col_stop\\\":15,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"    function y() {\\\"}\"}"
               input: []
               const_: false
-              output: ~
+              output:
+                Tuple: []
               core_mapping: ~
               block:
                 statements:
@@ -98,7 +100,8 @@ outputs:
               identifier: "{\"name\":\"z\",\"span\":\"{\\\"line_start\\\":10,\\\"line_stop\\\":10,\\\"col_start\\\":20,\\\"col_stop\\\":21,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"    const function z() {\\\"}\"}"
               input: []
               const_: true
-              output: ~
+              output:
+                Tuple: []
               core_mapping: ~
               block:
                 statements:
diff --git a/tests/expectations/parser/parser/circuits/ref_self.leo.out b/tests/expectations/parser/parser/circuits/ref_self.leo.out
index 36a7f97eae..b3c3c5975e 100644
--- a/tests/expectations/parser/parser/circuits/ref_self.leo.out
+++ b/tests/expectations/parser/parser/circuits/ref_self.leo.out
@@ -17,7 +17,8 @@ outputs:
               input:
                 - RefSelfKeyword: "{\"name\":\"&self\",\"span\":\"{\\\"line_start\\\":4,\\\"line_stop\\\":4,\\\"col_start\\\":16,\\\"col_stop\\\":21,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"    function x(&self) {\\\"}\"}"
               const_: false
-              output: ~
+              output:
+                Tuple: []
               core_mapping: ~
               block:
                 statements:
diff --git a/tests/expectations/parser/parser/circuits/self.leo.out b/tests/expectations/parser/parser/circuits/self.leo.out
index ab817ab360..fd996967f2 100644
--- a/tests/expectations/parser/parser/circuits/self.leo.out
+++ b/tests/expectations/parser/parser/circuits/self.leo.out
@@ -17,7 +17,8 @@ outputs:
               input:
                 - SelfKeyword: "{\"name\":\"self\",\"span\":\"{\\\"line_start\\\":4,\\\"line_stop\\\":4,\\\"col_start\\\":16,\\\"col_stop\\\":20,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"    function x(self) {\\\"}\"}"
               const_: false
-              output: ~
+              output:
+                Tuple: []
               core_mapping: ~
               block:
                 statements:
diff --git a/tests/expectations/parser/parser/expression/access/array_access.leo.out b/tests/expectations/parser/parser/expression/access/array_access.leo.out
index 06628e8fc3..5041dd4e32 100644
--- a/tests/expectations/parser/parser/expression/access/array_access.leo.out
+++ b/tests/expectations/parser/parser/expression/access/array_access.leo.out
@@ -237,7 +237,8 @@ outputs:
                   path: ""
                   content: "x(y)::y(x)"
             name: "{\"name\":\"y\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":7,\\\"col_stop\\\":8,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"x(y)::y(x)\\\"}\"}"
-            type_: ~
+            type_:
+              Tuple: []
             span:
               line_start: 1
               line_stop: 1
diff --git a/tests/expectations/parser/parser/expression/access/call.leo.out b/tests/expectations/parser/parser/expression/access/call.leo.out
index d92bccdcd6..3a35ac7ab6 100644
--- a/tests/expectations/parser/parser/expression/access/call.leo.out
+++ b/tests/expectations/parser/parser/expression/access/call.leo.out
@@ -70,7 +70,8 @@ outputs:
             inner:
               Identifier: "{\"name\":\"x\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":1,\\\"col_stop\\\":2,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"x::y()\\\"}\"}"
             name: "{\"name\":\"y\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":4,\\\"col_stop\\\":5,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"x::y()\\\"}\"}"
-            type_: ~
+            type_:
+              Tuple: []
             span:
               line_start: 1
               line_stop: 1
@@ -93,7 +94,8 @@ outputs:
             inner:
               Identifier: "{\"name\":\"x\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":1,\\\"col_stop\\\":2,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"x::y(x)\\\"}\"}"
             name: "{\"name\":\"y\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":4,\\\"col_stop\\\":5,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"x::y(x)\\\"}\"}"
-            type_: ~
+            type_:
+              Tuple: []
             span:
               line_start: 1
               line_stop: 1
diff --git a/tests/expectations/parser/parser/expression/access/circuit_static.leo.out b/tests/expectations/parser/parser/expression/access/circuit_static.leo.out
index 869d6a393e..9f45fb8237 100644
--- a/tests/expectations/parser/parser/expression/access/circuit_static.leo.out
+++ b/tests/expectations/parser/parser/expression/access/circuit_static.leo.out
@@ -7,7 +7,8 @@ outputs:
         inner:
           Identifier: "{\"name\":\"x\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":1,\\\"col_stop\\\":2,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"x::y\\\"}\"}"
         name: "{\"name\":\"y\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":4,\\\"col_stop\\\":5,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"x::y\\\"}\"}"
-        type_: ~
+        type_:
+          Tuple: []
         span:
           line_start: 1
           line_stop: 1
@@ -20,7 +21,8 @@ outputs:
         inner:
           Identifier: "{\"name\":\"X\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":1,\\\"col_stop\\\":2,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"X::Y\\\"}\"}"
         name: "{\"name\":\"Y\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":4,\\\"col_stop\\\":5,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"X::Y\\\"}\"}"
-        type_: ~
+        type_:
+          Tuple: []
         span:
           line_start: 1
           line_stop: 1
@@ -36,7 +38,8 @@ outputs:
               inner:
                 Identifier: "{\"name\":\"x\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":1,\\\"col_stop\\\":2,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"x::y::z\\\"}\"}"
               name: "{\"name\":\"y\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":4,\\\"col_stop\\\":5,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"x::y::z\\\"}\"}"
-              type_: ~
+              type_:
+                Tuple: []
               span:
                 line_start: 1
                 line_stop: 1
@@ -45,7 +48,8 @@ outputs:
                 path: ""
                 content: "x::y::z"
         name: "{\"name\":\"z\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":7,\\\"col_stop\\\":8,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"x::y::z\\\"}\"}"
-        type_: ~
+        type_:
+          Tuple: []
         span:
           line_start: 1
           line_stop: 1
@@ -60,7 +64,8 @@ outputs:
             inner:
               Identifier: "{\"name\":\"x\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":1,\\\"col_stop\\\":2,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"x::y()\\\"}\"}"
             name: "{\"name\":\"y\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":4,\\\"col_stop\\\":5,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"x::y()\\\"}\"}"
-            type_: ~
+            type_:
+              Tuple: []
             span:
               line_start: 1
               line_stop: 1
@@ -84,7 +89,8 @@ outputs:
               inner:
                 Identifier: "{\"name\":\"x\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":1,\\\"col_stop\\\":2,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"x::y.0\\\"}\"}"
               name: "{\"name\":\"y\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":4,\\\"col_stop\\\":5,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"x::y.0\\\"}\"}"
-              type_: ~
+              type_:
+                Tuple: []
               span:
                 line_start: 1
                 line_stop: 1
@@ -109,7 +115,8 @@ outputs:
               inner:
                 Identifier: "{\"name\":\"x\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":1,\\\"col_stop\\\":2,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"x::y[1u8]\\\"}\"}"
               name: "{\"name\":\"y\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":4,\\\"col_stop\\\":5,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"x::y[1u8]\\\"}\"}"
-              type_: ~
+              type_:
+                Tuple: []
               span:
                 line_start: 1
                 line_stop: 1
diff --git a/tests/expectations/parser/parser/expression/literal/access.leo.out b/tests/expectations/parser/parser/expression/literal/access.leo.out
index e2dbf60e24..e0bdaac835 100644
--- a/tests/expectations/parser/parser/expression/literal/access.leo.out
+++ b/tests/expectations/parser/parser/expression/literal/access.leo.out
@@ -51,7 +51,8 @@ outputs:
             inner:
               Identifier: "{\"name\":\"address\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":1,\\\"col_stop\\\":8,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"address::call()\\\"}\"}"
             name: "{\"name\":\"call\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":10,\\\"col_stop\\\":14,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"address::call()\\\"}\"}"
-            type_: ~
+            type_:
+              Tuple: []
             span:
               line_start: 1
               line_stop: 1
@@ -116,7 +117,8 @@ outputs:
             inner:
               Identifier: "{\"name\":\"bool\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":1,\\\"col_stop\\\":5,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"bool::call()\\\"}\"}"
             name: "{\"name\":\"call\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":7,\\\"col_stop\\\":11,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"bool::call()\\\"}\"}"
-            type_: ~
+            type_:
+              Tuple: []
             span:
               line_start: 1
               line_stop: 1
@@ -182,7 +184,8 @@ outputs:
             inner:
               Identifier: "{\"name\":\"char\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":1,\\\"col_stop\\\":5,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"char::call()\\\"}\"}"
             name: "{\"name\":\"call\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":7,\\\"col_stop\\\":11,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"char::call()\\\"}\"}"
-            type_: ~
+            type_:
+              Tuple: []
             span:
               line_start: 1
               line_stop: 1
@@ -247,7 +250,8 @@ outputs:
             inner:
               Identifier: "{\"name\":\"field\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":1,\\\"col_stop\\\":6,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"field::call()\\\"}\"}"
             name: "{\"name\":\"call\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":8,\\\"col_stop\\\":12,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"field::call()\\\"}\"}"
-            type_: ~
+            type_:
+              Tuple: []
             span:
               line_start: 1
               line_stop: 1
@@ -365,7 +369,8 @@ outputs:
             inner:
               Identifier: "{\"name\":\"group\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":1,\\\"col_stop\\\":6,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"group::call()\\\"}\"}"
             name: "{\"name\":\"call\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":8,\\\"col_stop\\\":12,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"group::call()\\\"}\"}"
-            type_: ~
+            type_:
+              Tuple: []
             span:
               line_start: 1
               line_stop: 1
@@ -563,7 +568,8 @@ outputs:
             inner:
               Identifier: "{\"name\":\"i8\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":1,\\\"col_stop\\\":3,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"i8::call()\\\"}\"}"
             name: "{\"name\":\"call\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":5,\\\"col_stop\\\":9,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"i8::call()\\\"}\"}"
-            type_: ~
+            type_:
+              Tuple: []
             span:
               line_start: 1
               line_stop: 1
@@ -586,7 +592,8 @@ outputs:
             inner:
               Identifier: "{\"name\":\"i16\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":1,\\\"col_stop\\\":4,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"i16::call()\\\"}\"}"
             name: "{\"name\":\"call\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":6,\\\"col_stop\\\":10,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"i16::call()\\\"}\"}"
-            type_: ~
+            type_:
+              Tuple: []
             span:
               line_start: 1
               line_stop: 1
@@ -609,7 +616,8 @@ outputs:
             inner:
               Identifier: "{\"name\":\"i32\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":1,\\\"col_stop\\\":4,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"i32::call()\\\"}\"}"
             name: "{\"name\":\"call\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":6,\\\"col_stop\\\":10,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"i32::call()\\\"}\"}"
-            type_: ~
+            type_:
+              Tuple: []
             span:
               line_start: 1
               line_stop: 1
@@ -632,7 +640,8 @@ outputs:
             inner:
               Identifier: "{\"name\":\"i64\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":1,\\\"col_stop\\\":4,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"i64::call()\\\"}\"}"
             name: "{\"name\":\"call\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":6,\\\"col_stop\\\":10,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"i64::call()\\\"}\"}"
-            type_: ~
+            type_:
+              Tuple: []
             span:
               line_start: 1
               line_stop: 1
@@ -655,7 +664,8 @@ outputs:
             inner:
               Identifier: "{\"name\":\"i128\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":1,\\\"col_stop\\\":5,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"i128::call()\\\"}\"}"
             name: "{\"name\":\"call\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":7,\\\"col_stop\\\":11,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"i128::call()\\\"}\"}"
-            type_: ~
+            type_:
+              Tuple: []
             span:
               line_start: 1
               line_stop: 1
@@ -853,7 +863,8 @@ outputs:
             inner:
               Identifier: "{\"name\":\"u8\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":1,\\\"col_stop\\\":3,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"u8::call()\\\"}\"}"
             name: "{\"name\":\"call\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":5,\\\"col_stop\\\":9,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"u8::call()\\\"}\"}"
-            type_: ~
+            type_:
+              Tuple: []
             span:
               line_start: 1
               line_stop: 1
@@ -876,7 +887,8 @@ outputs:
             inner:
               Identifier: "{\"name\":\"u16\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":1,\\\"col_stop\\\":4,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"u16::call()\\\"}\"}"
             name: "{\"name\":\"call\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":6,\\\"col_stop\\\":10,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"u16::call()\\\"}\"}"
-            type_: ~
+            type_:
+              Tuple: []
             span:
               line_start: 1
               line_stop: 1
@@ -899,7 +911,8 @@ outputs:
             inner:
               Identifier: "{\"name\":\"u32\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":1,\\\"col_stop\\\":4,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"u32::call()\\\"}\"}"
             name: "{\"name\":\"call\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":6,\\\"col_stop\\\":10,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"u32::call()\\\"}\"}"
-            type_: ~
+            type_:
+              Tuple: []
             span:
               line_start: 1
               line_stop: 1
@@ -922,7 +935,8 @@ outputs:
             inner:
               Identifier: "{\"name\":\"u64\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":1,\\\"col_stop\\\":4,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"u64::call()\\\"}\"}"
             name: "{\"name\":\"call\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":6,\\\"col_stop\\\":10,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"u64::call()\\\"}\"}"
-            type_: ~
+            type_:
+              Tuple: []
             span:
               line_start: 1
               line_stop: 1
@@ -945,7 +959,8 @@ outputs:
             inner:
               Identifier: "{\"name\":\"u128\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":1,\\\"col_stop\\\":5,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"u128::call()\\\"}\"}"
             name: "{\"name\":\"call\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":7,\\\"col_stop\\\":11,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"u128::call()\\\"}\"}"
-            type_: ~
+            type_:
+              Tuple: []
             span:
               line_start: 1
               line_stop: 1
diff --git a/tests/expectations/parser/parser/expression/unary/negate.leo.out b/tests/expectations/parser/parser/expression/unary/negate.leo.out
index 649b722072..b9b7b13156 100644
--- a/tests/expectations/parser/parser/expression/unary/negate.leo.out
+++ b/tests/expectations/parser/parser/expression/unary/negate.leo.out
@@ -43,7 +43,8 @@ outputs:
             inner:
               Identifier: "{\"name\":\"x\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":2,\\\"col_stop\\\":3,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"-x::y\\\"}\"}"
             name: "{\"name\":\"y\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":5,\\\"col_stop\\\":6,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"-x::y\\\"}\"}"
-            type_: ~
+            type_:
+              Tuple: []
             span:
               line_start: 1
               line_stop: 1
diff --git a/tests/expectations/parser/parser/expression/unary/not.leo.out b/tests/expectations/parser/parser/expression/unary/not.leo.out
index 71716da156..7f781ebe04 100644
--- a/tests/expectations/parser/parser/expression/unary/not.leo.out
+++ b/tests/expectations/parser/parser/expression/unary/not.leo.out
@@ -43,7 +43,8 @@ outputs:
             inner:
               Identifier: "{\"name\":\"x\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":2,\\\"col_stop\\\":3,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"!x::y\\\"}\"}"
             name: "{\"name\":\"y\",\"span\":\"{\\\"line_start\\\":1,\\\"line_stop\\\":1,\\\"col_start\\\":5,\\\"col_stop\\\":6,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"!x::y\\\"}\"}"
-            type_: ~
+            type_:
+              Tuple: []
             span:
               line_start: 1
               line_stop: 1
diff --git a/tests/expectations/parser/parser/functions/annotated.leo.out b/tests/expectations/parser/parser/functions/annotated.leo.out
index d9e264e6cf..1a145b4d3f 100644
--- a/tests/expectations/parser/parser/functions/annotated.leo.out
+++ b/tests/expectations/parser/parser/functions/annotated.leo.out
@@ -25,7 +25,8 @@ outputs:
         identifier: "{\"name\":\"a\",\"span\":\"{\\\"line_start\\\":4,\\\"line_stop\\\":4,\\\"col_start\\\":10,\\\"col_stop\\\":11,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"function a() {\\\"}\"}"
         input: []
         const_: false
-        output: ~
+        output:
+          Tuple: []
         core_mapping: ~
         block:
           statements:
@@ -77,7 +78,8 @@ outputs:
         identifier: "{\"name\":\"b\",\"span\":\"{\\\"line_start\\\":9,\\\"line_stop\\\":9,\\\"col_start\\\":10,\\\"col_stop\\\":11,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"function b() {\\\"}\"}"
         input: []
         const_: false
-        output: ~
+        output:
+          Tuple: []
         core_mapping: ~
         block:
           statements:
@@ -129,7 +131,8 @@ outputs:
         identifier: "{\"name\":\"c\",\"span\":\"{\\\"line_start\\\":14,\\\"line_stop\\\":14,\\\"col_start\\\":10,\\\"col_stop\\\":11,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"function c() {\\\"}\"}"
         input: []
         const_: false
-        output: ~
+        output:
+          Tuple: []
         core_mapping: ~
         block:
           statements:
@@ -180,7 +183,8 @@ outputs:
         identifier: "{\"name\":\"d\",\"span\":\"{\\\"line_start\\\":19,\\\"line_stop\\\":19,\\\"col_start\\\":10,\\\"col_stop\\\":11,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"function d() {\\\"}\"}"
         input: []
         const_: false
-        output: ~
+        output:
+          Tuple: []
         core_mapping: ~
         block:
           statements:
diff --git a/tests/expectations/parser/parser/functions/annotated_param.leo.out b/tests/expectations/parser/parser/functions/annotated_param.leo.out
index 5e5e8b0796..f3c999bdf2 100644
--- a/tests/expectations/parser/parser/functions/annotated_param.leo.out
+++ b/tests/expectations/parser/parser/functions/annotated_param.leo.out
@@ -26,7 +26,8 @@ outputs:
         identifier: "{\"name\":\"x\",\"span\":\"{\\\"line_start\\\":4,\\\"line_stop\\\":4,\\\"col_start\\\":10,\\\"col_stop\\\":11,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"function x() {\\\"}\"}"
         input: []
         const_: false
-        output: ~
+        output:
+          Tuple: []
         core_mapping: ~
         block:
           statements:
diff --git a/tests/expectations/parser/parser/functions/annotated_twice.leo.out b/tests/expectations/parser/parser/functions/annotated_twice.leo.out
index 7afe638d67..b8349608f2 100644
--- a/tests/expectations/parser/parser/functions/annotated_twice.leo.out
+++ b/tests/expectations/parser/parser/functions/annotated_twice.leo.out
@@ -35,7 +35,8 @@ outputs:
         identifier: "{\"name\":\"x\",\"span\":\"{\\\"line_start\\\":4,\\\"line_stop\\\":4,\\\"col_start\\\":10,\\\"col_stop\\\":11,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"function x() {\\\"}\"}"
         input: []
         const_: false
-        output: ~
+        output:
+          Tuple: []
         core_mapping: ~
         block:
           statements:
diff --git a/tests/expectations/parser/parser/functions/bounded_recursion.leo.out b/tests/expectations/parser/parser/functions/bounded_recursion.leo.out
index f9c4f602f9..25f3a5c370 100644
--- a/tests/expectations/parser/parser/functions/bounded_recursion.leo.out
+++ b/tests/expectations/parser/parser/functions/bounded_recursion.leo.out
@@ -28,7 +28,8 @@ outputs:
                 path: ""
                 content: "function x(const y: u32) {"
         const_: false
-        output: ~
+        output:
+          Tuple: []
         core_mapping: ~
         block:
           statements:
diff --git a/tests/expectations/parser/parser/functions/const_function.leo.out b/tests/expectations/parser/parser/functions/const_function.leo.out
index 142f12dfb9..f75b40f28f 100644
--- a/tests/expectations/parser/parser/functions/const_function.leo.out
+++ b/tests/expectations/parser/parser/functions/const_function.leo.out
@@ -15,7 +15,8 @@ outputs:
         identifier: "{\"name\":\"x\",\"span\":\"{\\\"line_start\\\":3,\\\"line_stop\\\":3,\\\"col_start\\\":16,\\\"col_stop\\\":17,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"const function x() {\\\"}\"}"
         input: []
         const_: true
-        output: ~
+        output:
+          Tuple: []
         core_mapping: ~
         block:
           statements:
diff --git a/tests/expectations/parser/parser/functions/const_param.leo.out b/tests/expectations/parser/parser/functions/const_param.leo.out
index f1302d128d..7e0806869c 100644
--- a/tests/expectations/parser/parser/functions/const_param.leo.out
+++ b/tests/expectations/parser/parser/functions/const_param.leo.out
@@ -41,7 +41,8 @@ outputs:
                 path: ""
                 content: "function x(x: u32, const y: i32) {"
         const_: false
-        output: ~
+        output:
+          Tuple: []
         core_mapping: ~
         block:
           statements:
@@ -108,7 +109,8 @@ outputs:
                 path: ""
                 content: "function x(const x: u32, y: i32) {"
         const_: false
-        output: ~
+        output:
+          Tuple: []
         core_mapping: ~
         block:
           statements:
diff --git a/tests/expectations/parser/parser/functions/const_self_bad.leo.out b/tests/expectations/parser/parser/functions/const_self_bad.leo.out
index 3b02d74ff3..5f314cf248 100644
--- a/tests/expectations/parser/parser/functions/const_self_bad.leo.out
+++ b/tests/expectations/parser/parser/functions/const_self_bad.leo.out
@@ -16,7 +16,8 @@ outputs:
         input:
           - ConstSelfKeyword: "{\"name\":\"const self\",\"span\":\"{\\\"line_start\\\":3,\\\"line_stop\\\":3,\\\"col_start\\\":12,\\\"col_stop\\\":22,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"function x(const self) {\\\"}\"}"
         const_: false
-        output: ~
+        output:
+          Tuple: []
         core_mapping: ~
         block:
           statements:
diff --git a/tests/expectations/parser/parser/functions/empty.leo.out b/tests/expectations/parser/parser/functions/empty.leo.out
index 4bd3bfbc1a..70fd7db2a7 100644
--- a/tests/expectations/parser/parser/functions/empty.leo.out
+++ b/tests/expectations/parser/parser/functions/empty.leo.out
@@ -15,7 +15,8 @@ outputs:
         identifier: "{\"name\":\"x\",\"span\":\"{\\\"line_start\\\":3,\\\"line_stop\\\":3,\\\"col_start\\\":10,\\\"col_stop\\\":11,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"function x() {\\\"}\"}"
         input: []
         const_: false
-        output: ~
+        output:
+          Tuple: []
         core_mapping: ~
         block:
           statements:
diff --git a/tests/expectations/parser/parser/functions/empty2.leo.out b/tests/expectations/parser/parser/functions/empty2.leo.out
index 60c3f10b1c..dc427f7383 100644
--- a/tests/expectations/parser/parser/functions/empty2.leo.out
+++ b/tests/expectations/parser/parser/functions/empty2.leo.out
@@ -15,7 +15,8 @@ outputs:
         identifier: "{\"name\":\"x\",\"span\":\"{\\\"line_start\\\":3,\\\"line_stop\\\":3,\\\"col_start\\\":10,\\\"col_stop\\\":11,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"function x() {}\\\"}\"}"
         input: []
         const_: false
-        output: ~
+        output:
+          Tuple: []
         core_mapping: ~
         block:
           statements: []
diff --git a/tests/expectations/parser/parser/functions/infinite_recursion.leo.out b/tests/expectations/parser/parser/functions/infinite_recursion.leo.out
index 93a823f907..3771595d1d 100644
--- a/tests/expectations/parser/parser/functions/infinite_recursion.leo.out
+++ b/tests/expectations/parser/parser/functions/infinite_recursion.leo.out
@@ -15,7 +15,8 @@ outputs:
         identifier: "{\"name\":\"inf\",\"span\":\"{\\\"line_start\\\":3,\\\"line_stop\\\":3,\\\"col_start\\\":10,\\\"col_stop\\\":13,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"function inf() {\\\"}\"}"
         input: []
         const_: false
-        output: ~
+        output:
+          Tuple: []
         core_mapping: ~
         block:
           statements:
diff --git a/tests/expectations/parser/parser/functions/param_array.leo.out b/tests/expectations/parser/parser/functions/param_array.leo.out
index b648d79414..f2207b9bae 100644
--- a/tests/expectations/parser/parser/functions/param_array.leo.out
+++ b/tests/expectations/parser/parser/functions/param_array.leo.out
@@ -30,7 +30,8 @@ outputs:
                 path: ""
                 content: "function x(x: [u8; 12]) {"
         const_: false
-        output: ~
+        output:
+          Tuple: []
         core_mapping: ~
         block:
           statements:
diff --git a/tests/expectations/parser/parser/functions/param_circuit.leo.out b/tests/expectations/parser/parser/functions/param_circuit.leo.out
index 2d18f67ce0..0dcb209b34 100644
--- a/tests/expectations/parser/parser/functions/param_circuit.leo.out
+++ b/tests/expectations/parser/parser/functions/param_circuit.leo.out
@@ -28,7 +28,8 @@ outputs:
                 path: ""
                 content: "function x(x: MyCircuit) {"
         const_: false
-        output: ~
+        output:
+          Tuple: []
         core_mapping: ~
         block:
           statements:
diff --git a/tests/expectations/parser/parser/functions/param_tuple.leo.out b/tests/expectations/parser/parser/functions/param_tuple.leo.out
index 17e104a53a..3cf90a9021 100644
--- a/tests/expectations/parser/parser/functions/param_tuple.leo.out
+++ b/tests/expectations/parser/parser/functions/param_tuple.leo.out
@@ -30,7 +30,8 @@ outputs:
                 path: ""
                 content: "function x(x: (u32, i32)) {"
         const_: false
-        output: ~
+        output:
+          Tuple: []
         core_mapping: ~
         block:
           statements:
diff --git a/tests/expectations/parser/parser/functions/params.leo.out b/tests/expectations/parser/parser/functions/params.leo.out
index 26c4fe8b37..28bf3aa1e6 100644
--- a/tests/expectations/parser/parser/functions/params.leo.out
+++ b/tests/expectations/parser/parser/functions/params.leo.out
@@ -41,7 +41,8 @@ outputs:
                 path: ""
                 content: "function x(x: u32, y: i32) {"
         const_: false
-        output: ~
+        output:
+          Tuple: []
         core_mapping: ~
         block:
           statements:
diff --git a/tests/expectations/parser/parser/serialize/linear_regression.leo.out b/tests/expectations/parser/parser/serialize/linear_regression.leo.out
index 58e8a73965..49aa6226dd 100644
--- a/tests/expectations/parser/parser/serialize/linear_regression.leo.out
+++ b/tests/expectations/parser/parser/serialize/linear_regression.leo.out
@@ -688,7 +688,8 @@ outputs:
                           inner:
                             Identifier: "{\"name\":\"LinearRegression\",\"span\":\"{\\\"line_start\\\":63,\\\"line_stop\\\":63,\\\"col_start\\\":31,\\\"col_stop\\\":47,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"  let reg: LinearRegression = LinearRegression::new(points);\\\"}\"}"
                           name: "{\"name\":\"new\",\"span\":\"{\\\"line_start\\\":63,\\\"line_stop\\\":63,\\\"col_start\\\":49,\\\"col_stop\\\":52,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"  let reg: LinearRegression = LinearRegression::new(points);\\\"}\"}"
-                          type_: ~
+                          type_:
+                            Tuple: []
                     arguments:
                       - Identifier: "{\"name\":\"points\",\"span\":\"{\\\"line_start\\\":63,\\\"line_stop\\\":63,\\\"col_start\\\":53,\\\"col_stop\\\":59,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"  let reg: LinearRegression = LinearRegression::new(points);\\\"}\"}"
             - Definition:
diff --git a/tests/expectations/parser/parser/serialize/palindrome.leo.out b/tests/expectations/parser/parser/serialize/palindrome.leo.out
index 25841225d5..c30dfafbf1 100644
--- a/tests/expectations/parser/parser/serialize/palindrome.leo.out
+++ b/tests/expectations/parser/parser/serialize/palindrome.leo.out
@@ -401,7 +401,8 @@ outputs:
         identifier: "{\"name\":\"test_is_palindrome\",\"span\":\"{\\\"line_start\\\":54,\\\"line_stop\\\":54,\\\"col_start\\\":10,\\\"col_stop\\\":28,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"function test_is_palindrome() {\\\"}\"}"
         input: []
         const_: false
-        output: ~
+        output:
+          Tuple: []
         core_mapping: ~
         block:
           statements:
diff --git a/tests/expectations/parser/parser/serialize/pedersen_hash.leo.out b/tests/expectations/parser/parser/serialize/pedersen_hash.leo.out
index b3bbe3797b..dff2be19c1 100644
--- a/tests/expectations/parser/parser/serialize/pedersen_hash.leo.out
+++ b/tests/expectations/parser/parser/serialize/pedersen_hash.leo.out
@@ -158,7 +158,8 @@ outputs:
                           inner:
                             Identifier: "{\"name\":\"PedersenHash\",\"span\":\"{\\\"line_start\\\":24,\\\"line_stop\\\":24,\\\"col_start\\\":36,\\\"col_stop\\\":48,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"    const pedersen: PerdesenHash = PedersenHash::new(parameters);\\\"}\"}"
                           name: "{\"name\":\"new\",\"span\":\"{\\\"line_start\\\":24,\\\"line_stop\\\":24,\\\"col_start\\\":50,\\\"col_stop\\\":53,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"    const pedersen: PerdesenHash = PedersenHash::new(parameters);\\\"}\"}"
-                          type_: ~
+                          type_:
+                            Tuple: []
                     arguments:
                       - Identifier: "{\"name\":\"parameters\",\"span\":\"{\\\"line_start\\\":24,\\\"line_stop\\\":24,\\\"col_start\\\":54,\\\"col_stop\\\":64,\\\"path\\\":\\\"\\\",\\\"content\\\":\\\"    const pedersen: PerdesenHash = PedersenHash::new(parameters);\\\"}\"}"
             - Return: