Merge pull request #1901 from AleoHQ/record-type

Implement record type

.licenserc.json

@@ -1,29 +0,0 @@
-{
-  "**/*.rs": [
-    "// Copyright (C) 2019-2022 Aleo Systems Inc.",
-    "// This file is part of the Leo library.",
-    "",
-    "// The Leo library is free software: you can redistribute it and/or modify",
-    "// it under the terms of the GNU General Public License as published by",
-    "// the Free Software Foundation, either version 3 of the License, or",
-    "// (at your option) any later version.",
-    "",
-    "// The Leo library is distributed in the hope that it will be useful,",
-    "// but WITHOUT ANY WARRANTY; without even the implied warranty of",
-    "// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the",
-    "// GNU General Public License for more details.",
-    "",
-    "// 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/>.",
-    ""
-  ],
-  "ignore": [
-    ".cargo",
-    ".github",
-    ".resources",
-    ".travis",
-    "examples",
-    "target/"
-  ]
-}
-

build.rs

@@ -57,8 +57,9 @@ fn check_file_licenses<P: AsRef<Path>>(path: P) {
                 .read_to_end(&mut contents)
                 .unwrap();
 
-            assert!(
+            assert_eq!(
-                contents == EXPECTED_LICENSE_TEXT,
+                contents,
+                EXPECTED_LICENSE_TEXT,
                 "The license in \"{}\" is either missing or it doesn't match the expected string!",
                 entry.path().display()
             );
@@ -72,5 +73,8 @@ fn check_file_licenses<P: AsRef<Path>>(path: P) {
 // The build script; it currently only checks the licenses.
 fn main() {
     // Check licenses in the current folder.
-    check_file_licenses(".");
+    if !cfg!(target_os = "windows") {
+        // disable license check for windows for now.
+        check_file_licenses(".");
+    }
 }

compiler/ast/src/circuits/circuit.rs

@@ -32,6 +32,9 @@ pub struct Circuit {
     pub identifier: Identifier,
     /// The fields, constant variables, and functions of this structure.
     pub members: Vec<CircuitMember>,
+    /// Was this a `record Foo { ... }`?
+    /// If so, it wasn't a circuit.
+    pub is_record: bool,
     /// The entire span of the circuit definition.
     pub span: Span,
 }
@@ -49,9 +52,18 @@ impl Circuit {
     pub fn name(&self) -> Symbol {
         self.identifier.name
     }
+}
 
-    fn format(&self, f: &mut fmt::Formatter) -> fmt::Result {
+impl fmt::Debug for Circuit {
-        writeln!(f, "circuit {} {{ ", self.identifier)?;
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        <Self as fmt::Display>::fmt(self, f)
+    }
+}
+
+impl fmt::Display for Circuit {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.write_str(if self.is_record { "record" } else { "circuit" })?;
+        writeln!(f, " {} {{ ", self.identifier)?;
         for field in self.members.iter() {
             writeln!(f, "    {}", field)?;
         }
@@ -59,16 +71,4 @@ impl Circuit {
     }
 }
 
-impl fmt::Debug for Circuit {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        self.format(f)
-    }
-}
-
-impl fmt::Display for Circuit {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        self.format(f)
-    }
-}
-
 crate::simple_node_impl!(Circuit);

compiler/ast/src/expressions/mod.rs

@@ -57,7 +57,7 @@ pub enum Expression {
     Binary(BinaryExpression),
     /// A call expression, e.g., `my_fun(args)`.
     Call(CallExpression),
-    /// An expression constructing a structure like `Foo { bar: 42, baz }`.
+    /// An expression constructing a circuit like `Foo { bar: 42, baz }`.
     CircuitInit(CircuitInitExpression),
     /// An expression of type "error".
     /// Will result in a compile error eventually.

compiler/ast/src/program.rs

@@ -38,18 +38,16 @@ pub struct Program {
     pub circuits: IndexMap<Identifier, Circuit>,
 }
 
-impl AsRef<Program> for Program {
-    fn as_ref(&self) -> &Program {
-        self
-    }
-}
-
 impl fmt::Display for Program {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         for (_, function) in self.functions.iter() {
             function.fmt(f)?;
             writeln!(f,)?;
         }
+        for (_, circuit) in self.circuits.iter() {
+            circuit.fmt(f)?;
+            writeln!(f,)?;
+        }
         write!(f, "")
     }
 }
@@ -66,12 +64,12 @@ impl Program {
     }
 
     /// Extract the name of the program.
-    pub fn get_name(&self) -> String {
+    pub fn name(&self) -> &str {
-        self.name.to_string()
+        &self.name
     }
 
     /// Sets the name of the program.
-    pub fn name(mut self, name: String) -> Self {
+    pub fn set_name(mut self, name: String) -> Self {
         self.name = name;
         self
     }

compiler/ast/src/types/type_.rs

@@ -60,7 +60,7 @@ impl Type {
             | (Type::Scalar, Type::Scalar)
             | (Type::String, Type::String) => true,
             (Type::IntegerType(left), Type::IntegerType(right)) => left.eq(right),
-            (Type::Identifier(left), Type::Identifier(right)) => left.eq(right),
+            (Type::Identifier(left), Type::Identifier(right)) => left.matches(right),
             _ => false,
         }
     }

compiler/parser/src/parser/expression.rs

@@ -16,7 +16,6 @@
 
 use super::*;
 use leo_errors::{ParserError, Result};
-use leo_span::sym;
 
 use snarkvm_dpc::{prelude::Address, testnet2::Testnet2};
 
@@ -537,17 +536,8 @@ impl ParserContext<'_> {
             Token::Ident(name) => {
                 let ident = Identifier { name, span };
                 if !self.disallow_circuit_construction && self.check(&Token::LeftCurly) {
-                    self.parse_circuit_expression(ident)?
+                    // Parse circuit and records inits as circuit expressions.
-                } else {
+                    // Enforce circuit or record type later at type checking.
-                    Expression::Identifier(ident)
-                }
-            }
-            Token::SelfUpper => {
-                let ident = Identifier {
-                    name: sym::SelfUpper,
-                    span,
-                };
-                if !self.disallow_circuit_construction && self.check(&Token::LeftCurly) {
                     self.parse_circuit_expression(ident)?
                 } else {
                     Expression::Identifier(ident)

compiler/parser/src/parser/file.rs

@@ -27,7 +27,7 @@ impl ParserContext<'_> {
 
         while self.has_next() {
             match &self.token.token {
-                Token::Circuit => {
+                Token::Circuit | Token::Record => {
                     let (id, circuit) = self.parse_circuit()?;
                     circuits.insert(id, circuit);
                 }
@@ -36,12 +36,10 @@ impl ParserContext<'_> {
                     functions.insert(id, function);
                 }
                 Token::Ident(sym::test) => return Err(ParserError::test_function(self.token.span).into()),
-                // Const functions share the first token with the global Const.
                 Token::Function => {
                     let (id, function) = self.parse_function()?;
                     functions.insert(id, function);
                 }
-
                 _ => return Err(Self::unexpected_item(&self.token).into()),
             }
         }
@@ -65,9 +63,9 @@ impl ParserContext<'_> {
         )
     }
 
-    /// Returns a [`CircuitMember`] AST node if the next tokens represent a circuit member variable
+    /// Returns a [`Vec<CircuitMember>`] AST node if the next tokens represent a circuit member variable
     /// or circuit member function or circuit member constant.
-    pub fn parse_circuit_declaration(&mut self) -> Result<(Vec<CircuitMember>, Span)> {
+    pub fn parse_circuit_members(&mut self) -> Result<(Vec<CircuitMember>, Span)> {
         let mut members = Vec::new();
 
         let (mut semi_colons, mut commas) = (false, false);
@@ -106,7 +104,7 @@ impl ParserContext<'_> {
     }
 
     /// Parses `IDENT: TYPE`.
-    fn parse_typed_field_name(&mut self) -> Result<(Identifier, Type)> {
+    fn parse_member(&mut self) -> Result<(Identifier, Type)> {
         let name = self.expect_ident()?;
         self.expect(&Token::Colon)?;
         let type_ = self.parse_all_types()?.0;
@@ -120,7 +118,7 @@ impl ParserContext<'_> {
         self.expect(&Token::Const)?;
 
         // `IDENT: TYPE = EXPR`:
-        let (_name, _type_) = self.parse_typed_field_name()?;
+        let (_name, _type_) = self.parse_member()?;
         self.expect(&Token::Assign)?;
         let expr = self.parse_expression()?;
 
@@ -134,7 +132,7 @@ impl ParserContext<'_> {
 
     /// Returns a [`CircuitMember`] AST node if the next tokens represent a circuit member variable.
     pub fn parse_member_variable_declaration(&mut self) -> Result<CircuitMember> {
-        let (name, type_) = self.parse_typed_field_name()?;
+        let (name, type_) = self.parse_member()?;
 
         Ok(CircuitMember::CircuitVariable(name, type_))
     }
@@ -145,26 +143,28 @@ impl ParserContext<'_> {
             // CAUTION: function members are unstable for testnet3.
             let function = self.parse_function()?;
 
-            return Err(ParserError::circuit_functions_unstable(function.1.span()).into());
+            Err(ParserError::circuit_functions_unstable(function.1.span()).into())
             // Ok(CircuitMember::CircuitFunction(Box::new(function.1)))
         } else {
-            return Err(Self::unexpected_item(&self.token).into());
+            Err(Self::unexpected_item(&self.token).into())
         }
     }
 
-    /// Returns an [`(Identifier, Function)`] ast node if the next tokens represent a circuit declaration.
+    /// Parses a circuit or record definition, e.g., `circit Foo { ... }` or `record Foo { ... }`.
     pub(super) fn parse_circuit(&mut self) -> Result<(Identifier, Circuit)> {
-        let start = self.expect(&Token::Circuit)?;
+        let is_record = matches!(&self.token.token, Token::Record);
+        let start = self.expect_any(&[Token::Circuit, Token::Record])?;
         let circuit_name = self.expect_ident()?;
 
         self.expect(&Token::LeftCurly)?;
-        let (members, end) = self.parse_circuit_declaration()?;
+        let (members, end) = self.parse_circuit_members()?;
 
         Ok((
-            circuit_name.clone(),
+            circuit_name,
             Circuit {
                 identifier: circuit_name,
                 members,
+                is_record,
                 span: start + end,
             },
         ))

compiler/parser/src/tokenizer/lexer.rs

@@ -316,6 +316,7 @@ impl Token {
                     "in" => Token::In,
                     "let" => Token::Let,
                     "public" => Token::Public,
+                    "record" => Token::Record,
                     "return" => Token::Return,
                     "scalar" => Token::Scalar,
                     "string" => Token::String,

compiler/parser/src/tokenizer/token.rs

@@ -89,7 +89,7 @@ pub enum Token {
     U32,
     U64,
     U128,
-    SelfUpper,
+    Record,
 
     // Regular Keywords
     Circuit,
@@ -140,9 +140,9 @@ pub const KEYWORD_TOKENS: &[Token] = &[
     Token::In,
     Token::Let,
     Token::Public,
+    Token::Record,
     Token::Return,
     Token::SelfLower,
-    Token::SelfUpper,
     Token::Scalar,
     Token::Static,
     Token::String,
@@ -184,10 +184,10 @@ impl Token {
             Token::In => sym::In,
             Token::Let => sym::Let,
             Token::Public => sym::Public,
+            Token::Record => sym::record,
             Token::Return => sym::Return,
             Token::Scalar => sym::scalar,
             Token::SelfLower => sym::SelfLower,
-            Token::SelfUpper => sym::SelfUpper,
             Token::Static => sym::Static,
             Token::String => sym::string,
             Token::True => sym::True,
@@ -267,7 +267,7 @@ impl fmt::Display for Token {
             U32 => write!(f, "u32"),
             U64 => write!(f, "u64"),
             U128 => write!(f, "u128"),
-            SelfUpper => write!(f, "Self"),
+            Record => write!(f, "record"),
 
             Circuit => write!(f, "circuit"),
             Console => write!(f, "console"),

compiler/passes/src/symbol_table/table.rs

@@ -58,9 +58,14 @@ impl<'a> SymbolTable<'a> {
     }
 
     pub fn insert_circuit(&mut self, symbol: Symbol, insert: &'a Circuit) -> Result<()> {
-        if self.circuits.contains_key(&symbol) {
+        if let Some(existing) = self.circuits.get(&symbol) {
-            // Return an error if the circuit name has already been inserted.
+            // Error if the circuit or record already exists.
-            return Err(AstError::shadowed_circuit(symbol, insert.span).into());
+            let err = if existing.is_record {
+                AstError::shadowed_record(symbol, insert.span).into()
+            } else {
+                AstError::shadowed_circuit(symbol, insert.span).into()
+            };
+            return Err(err);
         }
         self.circuits.insert(symbol, insert);
         Ok(())
@@ -99,7 +104,7 @@ impl<'a> SymbolTable<'a> {
     }
 }
 
-impl<'a> Display for SymbolTable<'a> {
+impl Display for SymbolTable<'_> {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         write!(f, "SymbolTable")?;
 

compiler/passes/src/type_checker/check_expressions.rs

@@ -528,20 +528,20 @@ impl<'a> ExpressionVisitor<'a> for TypeChecker<'a> {
             }
 
             // Check circuit member types.
-            circ.members.iter().for_each(|expected| match expected {
+            circ.members
-                CircuitMember::CircuitVariable(name, type_) => {
+                .iter()
+                .for_each(|CircuitMember::CircuitVariable(name, ty)| {
                     // Lookup circuit variable name.
                     if let Some(actual) = input.members.iter().find(|member| member.identifier.name == name.name) {
                         if let Some(expr) = &actual.expression {
-                            self.visit_expression(expr, &Some(*type_));
+                            self.visit_expression(expr, &Some(*ty));
                         }
                     } else {
                         self.handler.emit_err(
                             TypeCheckerError::unknown_sym("circuit member variable", name, name.span()).into(),
                         );
                     };
-                }
+                });
-            });
 
             Some(ret)
         } else {

compiler/passes/src/type_checker/check_program.rs

@@ -18,6 +18,7 @@ use crate::{Declaration, TypeChecker, VariableSymbol};
 use leo_ast::*;
 use leo_errors::TypeCheckerError;
 
+use leo_span::sym;
 use std::collections::HashSet;
 
 impl<'a> ProgramVisitor<'a> for TypeChecker<'a> {
@@ -53,8 +54,32 @@ impl<'a> ProgramVisitor<'a> for TypeChecker<'a> {
         // Check for conflicting circuit member names.
         let mut used = HashSet::new();
         if !input.members.iter().all(|member| used.insert(member.name())) {
-            self.handler
+            self.handler.emit_err(if input.is_record {
-                .emit_err(TypeCheckerError::duplicate_circuit_member(input.name(), input.span()).into());
+                TypeCheckerError::duplicate_record_variable(input.name(), input.span()).into()
+            } else {
+                TypeCheckerError::duplicate_circuit_member(input.name(), input.span()).into()
+            });
+        }
+
+        // For records, enforce presence of `owner: Address` and `balance: u64` members.
+        if input.is_record {
+            let check_has_field = |need, expected_ty: Type| match input
+                .members
+                .iter()
+                .find_map(|CircuitMember::CircuitVariable(v, t)| (v.name == need).then(|| (v, t)))
+            {
+                Some((_, actual_ty)) if expected_ty.eq_flat(actual_ty) => {} // All good, found + right type!
+                Some((field, _)) => {
+                    self.handler
+                        .emit_err(TypeCheckerError::record_var_wrong_type(field, expected_ty, input.span()).into());
+                }
+                None => {
+                    self.handler
+                        .emit_err(TypeCheckerError::required_record_variable(need, expected_ty, input.span()).into());
+                }
+            };
+            check_has_field(sym::owner, Type::Address);
+            check_has_field(sym::balance, Type::IntegerType(IntegerType::U64));
         }
     }
 }

compiler/passes/src/type_checker/checker.rs

@@ -103,12 +103,16 @@ impl<'a> TypeChecker<'a> {
         }
     }
 
+    /// Emits a type checker error.
+    pub(crate) fn emit_err(&self, err: TypeCheckerError) {
+        self.handler.emit_err(err.into());
+    }
+
     /// Emits an error if the given type conflicts with a core library type.
     pub(crate) fn check_ident_type(&self, type_: &Option<Type>) {
         if let Some(Type::Identifier(ident)) = type_ {
             if self.account_types.contains(&ident.name) || self.algorithms_types.contains(&ident.name) {
-                self.handler
+                self.emit_err(TypeCheckerError::core_type_name_conflict(&ident.name, ident.span()));
-                    .emit_err(TypeCheckerError::core_type_name_conflict(&ident.name, ident.span()).into());
             }
         }
     }
@@ -121,9 +125,11 @@ impl<'a> TypeChecker<'a> {
             match CoreInstruction::from_symbols(ident.name, function.name) {
                 None => {
                     // Not a core library circuit.
-                    self.handler.emit_err(
+                    self.emit_err(TypeCheckerError::invalid_core_instruction(
-                        TypeCheckerError::invalid_core_instruction(&ident.name, function.name, ident.span()).into(),
+                        &ident.name,
-                    );
+                        function.name,
+                        ident.span(),
+                    ));
                 }
                 Some(core_circuit) => return Some(core_circuit),
             }
@@ -134,12 +140,10 @@ impl<'a> TypeChecker<'a> {
     /// Emits an error if the two given types are not equal.
     pub(crate) fn assert_eq_types(&self, t1: Option<Type>, t2: Option<Type>, span: Span) {
         match (t1, t2) {
-            (Some(t1), Some(t2)) if t1 != t2 => self
+            (Some(t1), Some(t2)) if t1 != t2 => self.emit_err(TypeCheckerError::type_should_be(t1, t2, span)),
-                .handler
+            (Some(type_), None) | (None, Some(type_)) => {
-                .emit_err(TypeCheckerError::type_should_be(t1, t2, span).into()),
+                self.emit_err(TypeCheckerError::type_should_be("no type", type_, span))
-            (Some(type_), None) | (None, Some(type_)) => self
+            }
-                .handler
-                .emit_err(TypeCheckerError::type_should_be("no type", type_, span).into()),
             _ => {}
         }
     }
@@ -147,9 +151,8 @@ impl<'a> TypeChecker<'a> {
     /// Returns the `circuit` type and emits an error if the `expected` type does not match.
     pub(crate) fn assert_expected_circuit(&mut self, circuit: Identifier, expected: &Option<Type>, span: Span) -> Type {
         if let Some(Type::Identifier(expected)) = expected {
-            if expected.name != circuit.name {
+            if !circuit.matches(expected) {
-                self.handler
+                self.emit_err(TypeCheckerError::type_should_be(circuit.name, expected.name, span));
-                    .emit_err(TypeCheckerError::type_should_be(circuit.name, expected.name, span).into());
             }
         }
 
@@ -159,9 +162,8 @@ impl<'a> TypeChecker<'a> {
     /// Returns the given `actual` type and emits an error if the `expected` type does not match.
     pub(crate) fn assert_expected_option(&mut self, actual: Type, expected: &Option<Type>, span: Span) -> Type {
         if let Some(expected) = expected {
-            if &actual != expected {
+            if !actual.eq_flat(expected) {
-                self.handler
+                self.emit_err(TypeCheckerError::type_should_be(actual, expected, span));
-                    .emit_err(TypeCheckerError::type_should_be(actual, expected, span).into());
             }
         }
 
@@ -172,9 +174,8 @@ impl<'a> TypeChecker<'a> {
     /// `span` should be the location of the expected type.
     pub(crate) fn assert_expected_type(&mut self, actual: &Option<Type>, expected: Type, span: Span) -> Type {
         if let Some(actual) = actual {
-            if actual != &expected {
+            if !actual.eq_flat(&expected) {
-                self.handler
+                self.emit_err(TypeCheckerError::type_should_be(actual, expected, span));
-                    .emit_err(TypeCheckerError::type_should_be(actual, expected, span).into());
             }
         }
 
@@ -185,14 +186,11 @@ impl<'a> TypeChecker<'a> {
     pub(crate) fn assert_one_of_types(&self, type_: &Option<Type>, expected: &[Type], span: Span) {
         if let Some(type_) = type_ {
             if !expected.iter().any(|t: &Type| t == type_) {
-                self.handler.emit_err(
+                self.emit_err(TypeCheckerError::expected_one_type_of(
-                    TypeCheckerError::expected_one_type_of(
+                    expected.iter().map(|t| t.to_string() + ",").collect::<String>(),
-                        expected.iter().map(|t| t.to_string() + ",").collect::<String>(),
+                    type_,
-                        type_,
+                    span,
-                        span,
+                ));
-                    )
-                    .into(),
-                );
             }
         }
     }

docs/grammar/abnf-grammar.txt

@@ -96,6 +96,7 @@ keyword = %s"address"
         / %s"in"
         / %s"let"
         / %s"public"
+        / %s"record"
         / %s"return"
         / %s"scalar"
         / %s"string"
@@ -395,8 +396,13 @@ circuit-declaration = %s"circuit" "{" circuit-component-declaration
 
 circuit-component-declaration = identifier ":" type
 
+record-declaration = %s"record" "{" circuit-component-declaration
+                                    *( "," circuit-component-declaration )
+                                    [ "," ] "}"
+
 declaration = function-declaration
             / circuit-declaration
+            / record-declaration
 
 file = *declaration
 

examples/hello-world/src/main.leo

@@ -1,8 +1,23 @@
-circuit Foo {
+record Token {
-    x: u8,
+    // The token owner.
-    y: u8,
+    owner: address,
+    // The Aleo balance (in gates).
+    balance: u64,
+    // The token amount.
+    amount: u64,
 }
 
-function main(a: u8) -> field {
+function mint(owner: address, amount: u64) -> Token {
-    return BHP256::hash(a);
+    return Token {
+        owner,
+        balance: 0u64,
+        amount,
+    };
+}
+
+function main(x: address) -> u64 {
+    const c: u64 = 1u64;
+    let t: Token = mint(x, c);
+
+    return t.balance;
 }

examples/token/src/main.leo

@@ -1,6 +1,6 @@
 // CAUTION: Work in progress
 
-circuit Token {
+record Token {
     // The token owner.
     owner: address,
     // The Aleo balance (in gates).
@@ -42,7 +42,7 @@ function transfer(r0: Token, r1: Receiver) -> Token {
     let r4: Token = mint(r0.owner, r0.amount);
 
     // return (r3, r4);
-    return r3
+    return r3;
 }
 
 function main() -> u8 {

leo/errors/src/errors/ast/ast_errors.rs

@@ -155,6 +155,14 @@ create_messages!(
         help: None,
     }
 
+    /// For when a user shadows a record.
+    @formatted
+    shadowed_record {
+        args: (record: impl Display),
+        msg: format!("record `{record}` shadowed by"),
+        help: None,
+    }
+
     /// For when a user shadows a variable.
     @formatted
     shadowed_variable {

leo/errors/src/errors/type_checker/type_checker_error.rs

@@ -191,6 +191,16 @@ create_messages!(
         help: None,
     }
 
+    /// For when the user tries initialize a circuit with the incorrect number of args.
+    @formatted
+    incorrect_num_record_variables {
+        args: (expected: impl Display, received: impl Display),
+        msg: format!(
+            "Record expected `{expected}` variables, but got `{received}`",
+        ),
+        help: None,
+    }
+
     /// An invalid access call is made e.g., `bool::MAX`
     @formatted
     invalid_access_expression {
@@ -211,6 +221,16 @@ create_messages!(
         help: None,
     }
 
+    /// Attempted to define more that one record variable with the same name.
+    @formatted
+    duplicate_record_variable {
+        args: (record: impl Display),
+        msg: format!(
+            "Record {record} defined with more than one variable with the same name."
+        ),
+        help: None,
+    }
+
     /// Attempted to access an invalid circuit.
     @formatted
     invalid_circuit {
@@ -230,4 +250,18 @@ create_messages!(
         ),
         help: None,
     }
+
+    @formatted
+    required_record_variable {
+        args: (name: impl Display, type_: impl Display),
+        msg: format!("The `record` type requires the variable `{name}: {type_}`."),
+        help: None,
+    }
+
+    @formatted
+    record_var_wrong_type {
+        args: (name: impl Display, type_: impl Display),
+        msg: format!("The field `{name}` in a `record` must have type `{type_}`."),
+        help: None,
+    }
 );

leo/span/src/dropless.rs

@@ -16,7 +16,6 @@
 
 // Copyright Rust project developers under MIT or APACHE-2.0.
 
-
 use core::alloc::Layout;
 use core::cell::{Cell, RefCell};
 use core::mem::{self, MaybeUninit};

leo/span/src/span.rs

@@ -14,7 +14,6 @@
 // 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/>.
 
-
 //! Defines the `Span` type used to track where code comes from.
 
 use core::ops::{Add, Sub};

leo/span/src/symbol.rs

@@ -14,7 +14,6 @@
 // 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 crate::dropless::DroplessArena;
 use crate::source_map::SourceMap;
 
@@ -165,6 +164,7 @@ symbols! {
     i32,
     i64,
     i128,
+    record,
     scalar,
     string,
     u8,
@@ -208,6 +208,12 @@ symbols! {
     test,
     Type: "type",
 
+    public,
+    private,
+    owner,
+    balance,
+
+    // todo: remove these.
     CONTAINER_PSEUDO_CIRCUIT: "$InputContainer",
     REGISTERS_PSEUDO_CIRCUIT: "$InputRegister",
     RECORD_PSEUDO_CIRCUIT: "$InputRecord",
@@ -216,11 +222,8 @@ symbols! {
 
     // input file
     registers,
-    record,
     state,
     state_leaf,
-    public,
-    private,
 }
 
 /// An interned string.

tests/compiler/records/balance_wrong_ty.leo

@@ -0,0 +1,14 @@
+/*
+namespace: Compile
+expectation: Fail
+*/
+
+// This record does define the `balance` variable but with the wrong type.
+record Token {
+    balance: address,
+    owner: address,
+}
+
+function main() -> bool {
+    return true;
+}

tests/compiler/records/declaration.leo

@@ -0,0 +1,17 @@
+/*
+namespace: Compile
+expectation: Pass
+*/
+
+record Token {
+    // The token owner.
+    owner: address,
+    // The Aleo balance (in gates).
+    balance: u64,
+    // The token amount.
+    amount: u64,
+}
+
+function main() -> bool {
+    return true;
+}

tests/compiler/records/duplicate_circuit_name_fail.leo

@@ -0,0 +1,21 @@
+/*
+namespace: Compile
+expectation: Fail
+*/
+
+record Token {
+    // The token owner.
+    owner: address,
+    // The Aleo balance (in gates).
+    balance: u64,
+    // The token amount.
+    amount: u64,
+}
+
+circuit Token { // This circuit cannot have the same name as the record defined above it.
+    x: u32,
+}
+
+function main() -> bool {
+    return true;
+}

tests/compiler/records/duplicate_var_fail.leo

@@ -0,0 +1,19 @@
+/*
+namespace: Compile
+expectation: Fail
+*/
+
+record Token {
+    // The token owner.
+    owner: address,
+    // The token owner.
+    owner: address, // Cannot define two record variables with the same name.
+    // The Aleo balance (in gates).
+    balance: u64,
+    // The token amount.
+    amount: u64,
+}
+
+function main() -> bool {
+    return true;
+}

tests/compiler/records/init_expression.leo

@@ -0,0 +1,28 @@
+/*
+namespace: Compile
+expectation: Pass
+*/
+
+record Token {
+    // The token owner.
+    owner: address,
+    // The Aleo balance (in gates).
+    balance: u64,
+    // The token amount.
+    amount: u64,
+}
+
+function mint(r0: address, r1: u64) -> Token {
+    return Token {
+        owner: r0,
+        balance: 0u64,
+        amount: r1,
+    };
+}
+
+function main(x: address) -> u64 {
+    const c: u64 = 1u64;
+    let t: Token = mint(x, c);
+
+    return t.balance;
+}

tests/compiler/records/init_expression_shorthand.leo

@@ -0,0 +1,28 @@
+/*
+namespace: Compile
+expectation: Pass
+*/
+
+record Token {
+    // The token owner.
+    owner: address,
+    // The Aleo balance (in gates).
+    balance: u64,
+    // The token amount.
+    amount: u64,
+}
+
+function mint(owner: address, amount: u64) -> Token {
+    return Token {
+        owner,
+        balance: 0u64,
+        amount,
+    };
+}
+
+function main(x: address) -> u64 {
+    const c: u64 = 1u64;
+    let t: Token = mint(x, c);
+
+    return t.balance;
+}

tests/compiler/records/init_expression_type_fail.leo

@@ -0,0 +1,28 @@
+/*
+namespace: Compile
+expectation: Fail
+*/
+
+record Token {
+    // The token owner.
+    owner: address,
+    // The Aleo balance (in gates).
+    balance: u64,
+    // The token amount.
+    amount: u64,
+}
+
+function mint(r0: address, r1: u64) -> Token {
+    return Token {
+        owner: r1, // This variable should be type address.
+        balance: 0u64,
+        amount: r0, // This variable should be type u64.
+    };
+}
+
+function main(x: address) -> u64 {
+    const c: u64 = 1u64;
+    let t: Token = mint(x, c);
+
+    return t.balance;
+}

tests/compiler/records/init_expression_var_fail.leo

@@ -0,0 +1,28 @@
+/*
+namespace: Compile
+expectation: Fail
+*/
+
+record Token {
+    // The token owner.
+    owner: address,
+    // The Aleo balance (in gates).
+    balance: u64,
+    // The token amount.
+    amount: u64,
+}
+
+function mint(r0: address, r1: u64) -> Token {
+    return Token {
+        sender: r0, // This variable should be named `owner`.
+        balance: 0u64,
+        amount: r1,
+    };
+}
+
+function main(x: address) -> u64 {
+    const c: u64 = 1u64;
+    let t: Token = mint(x, c);
+
+    return t.balance;
+}

tests/compiler/records/no_owner_fail.leo

@@ -0,0 +1,16 @@
+/*
+namespace: Compile
+expectation: Fail
+*/
+
+// This record does not define the `owner` variable required for a record type.
+record Token {
+    // The Aleo balance (in gates).
+    balance: u64,
+    // The token amount.
+    amount: u64,
+}
+
+function main() -> bool {
+    return true;
+}

tests/compiler/records/owner_wrong_ty.leo

@@ -0,0 +1,14 @@
+/*
+namespace: Compile
+expectation: Fail
+*/
+
+// This record does define the `owner` variable but with the wrong type.
+record Token {
+    balance: u64,
+    owner: bool,
+}
+
+function main() -> bool {
+    return true;
+}

tests/expectations/compiler/compiler/circuits/duplicate_circuit_variable.out

@@ -2,4 +2,4 @@
 namespace: Compile
 expectation: Fail
 outputs:
-  - "Error [ETYC0372018]: Circuit Bar defined with more than one member with the same name.\n    --> compiler-test:3:1\n     |\n   3 | circuit Bar {\n   4 |     x: u32,\n   5 |     x: u32,\n   6 | }\n     | ^\n"
+  - "Error [ETYC0372019]: Circuit Bar defined with more than one member with the same name.\n    --> compiler-test:3:1\n     |\n   3 | circuit Bar {\n   4 |     x: u32,\n   5 |     x: u32,\n   6 | }\n     | ^\n"

tests/expectations/compiler/compiler/circuits/duplicate_name_context.out

@@ -4,5 +4,5 @@ expectation: Pass
 outputs:
   - output:
       - initial_input_ast: acb54d555ee391d519919827f5949bf1600d18004ce461097d062f91108563ba
-    initial_ast: 347eb4d4a124a759627e26bad6ea283b07b7bc07ab35dc1576faf699c3d91e3d
+    initial_ast: 2fd04130d93c29b06f1288c682dd1ce37731ef0762f8e8d70d994aa97fa55c1e
     symbol_table: d522662a21597d6d4b9ca630498b48f40ad05fb289080451879c90c3530de28b

tests/expectations/compiler/compiler/circuits/inline.out

@@ -4,5 +4,5 @@ expectation: Pass
 outputs:
   - output:
       - initial_input_ast: no input
-    initial_ast: c7a7ae897a82a174983ec9e81f0bcc11328fc55ea24111523131e345a363d9b8
+    initial_ast: 8507cd1753f4d2a835fa34d3d784487d89d595ea415d51145dd7291a839159c2
     symbol_table: e6f85704fccd0ca0f0461ae54cb604159a5f41a2175aad6b76bd534166f1bc6b

tests/expectations/compiler/compiler/circuits/inline_member_pass.out

@@ -4,5 +4,5 @@ expectation: Pass
 outputs:
   - output:
       - initial_input_ast: no input
-    initial_ast: 7c16a20b88d661dab8e581d47998252fc0bd2a93199f8b4945c924ade5ebae36
+    initial_ast: 9489ab9b78bd31ac516e1674a83c6b35708238174df88374a7b19cef3d4a8e8a
     symbol_table: 9eeb9c327aa691ac9126681fa2d4be149bb69621d30ac30a1432b52e42b56307

tests/expectations/compiler/compiler/circuits/member_variable.out

@@ -4,5 +4,5 @@ expectation: Pass
 outputs:
   - output:
       - initial_input_ast: 29f6139d908d390f890f04d8ee620757d29b7f71cd48c46ff65bc1e70aae840c
-    initial_ast: 6e1af09bb13f26f60786c16f66286caffa646eae44511c08c2f6be46d8a1a3d1
+    initial_ast: 630995cc22fb6ec613f02e3aaa18392770158b2bbaf5aa1736c0bf71dd7357ce
     symbol_table: 1e3d03c1d2a087812fc00dd4c1b48174df13bc5278fd65c104c9a904644061db

tests/expectations/compiler/compiler/core/account/record.out

@@ -2,4 +2,4 @@
 namespace: Compile
 expectation: Fail
 outputs:
-  - "Error [ETYC0372014]: The type Record is a reserved core type name.\n    --> compiler-test:4:30\n     |\n   4 | function main(public record: Record, a: bool) -> bool {\n     |                              ^^^^^^\n"
+  - "Error [EPAR0370009]: unexpected string: expected 'ident', got 'record'\n    --> compiler-test:4:22\n     |\n   4 | function main(public record: Record, a: bool) -> bool {\n     |                      ^^^^^^"

tests/expectations/compiler/compiler/function/duplicate_parameter_fail.out

@@ -2,4 +2,4 @@
 namespace: Compile
 expectation: Fail
 outputs:
-  - "Error [EAST0372016]: variable `a` shadowed by\n    --> compiler-test:3:23\n     |\n   3 | function main(a: u32, a: u32) -> u32 {\n     |                       ^\n"
+  - "Error [EAST0372017]: variable `a` shadowed by\n    --> compiler-test:3:23\n     |\n   3 | function main(a: u32, a: u32) -> u32 {\n     |                       ^\n"

tests/expectations/compiler/compiler/records/balance_wrong_ty.out

@@ -0,0 +1,5 @@
+---
+namespace: Compile
+expectation: Fail
+outputs:
+  - "Error [ETYC0372024]: The field `balance` in a `record` must have type `u64`.\n    --> compiler-test:4:1\n     |\n   4 | record Token {\n   5 |     balance: address,\n   6 |     owner: address,\n   7 | }\n     | ^\n"

tests/expectations/compiler/compiler/records/declaration.out

@@ -0,0 +1,8 @@
+---
+namespace: Compile
+expectation: Pass
+outputs:
+  - output:
+      - initial_input_ast: no input
+    initial_ast: ed6dbb2a60da9a91da4b3845e3919b0520666cf4d7223e5634e1e8e38dd9243d
+    symbol_table: c49906bcded430e36886bfabc35c5740e4657ac82761b80b871f6d19ec6d9dda

tests/expectations/compiler/compiler/records/duplicate_circuit_name_fail.out

@@ -0,0 +1,5 @@
+---
+namespace: Compile
+expectation: Fail
+outputs:
+  - "Error [EAST0372016]: record `Token` shadowed by\n    --> compiler-test:12:1\n     |\n  12 | circuit Token { // This circuit cannot have the same name as the record defined above it.\n  13 |     x: u32,\n  14 | }\n     | ^\n"

tests/expectations/compiler/compiler/records/duplicate_var_fail.out

@@ -0,0 +1,5 @@
+---
+namespace: Compile
+expectation: Fail
+outputs:
+  - "Error [ETYC0372020]: Record Token defined with more than one variable with the same name.\n    --> compiler-test:3:1\n     |\n   3 | record Token {\n   4 |     // The token owner.\n   5 |     owner: address,\n   6 |     // The token owner.\n   7 |     owner: address, // Cannot define two record variables with the same name.\n   8 |     // The Aleo balance (in gates).\n   9 |     balance: u64,\n  10 |     // The token amount.\n  11 |     amount: u64,\n  12 | }\n     | ^\n"

tests/expectations/compiler/compiler/records/init_expression.out

@@ -0,0 +1,8 @@
+---
+namespace: Compile
+expectation: Pass
+outputs:
+  - output:
+      - initial_input_ast: no input
+    initial_ast: cc9fdc5ee476d5c8930260c5fc50c968915434892180f0084f15cd69b905dc20
+    symbol_table: 926c2f494fbb7914574e7b95bedd8992eaf028143e19bebcdcdf474fcb5eb1c5

tests/expectations/compiler/compiler/records/init_expression_shorthand.out

@@ -0,0 +1,8 @@
+---
+namespace: Compile
+expectation: Pass
+outputs:
+  - output:
+      - initial_input_ast: no input
+    initial_ast: c765de9e29d4ca9bd9ba2f7a5ee72c2e4c8278948d32a6c9a441f5eacde564ea
+    symbol_table: de1844db50840db6655f51a2903da4287d51c03a6e693843bdd6be95c6d627f8

tests/expectations/compiler/compiler/records/init_expression_type_fail.out

@@ -0,0 +1,5 @@
+---
+namespace: Compile
+expectation: Fail
+outputs:
+  - "Error [ETYC0372003]: Found type `u64` but type `address` was expected\n    --> compiler-test:12:28\n     |\n  12 | function mint(r0: address, r1: u64) -> Token {\n     |                            ^^\nError [ETYC0372003]: Found type `address` but type `u64` was expected\n    --> compiler-test:12:15\n     |\n  12 | function mint(r0: address, r1: u64) -> Token {\n     |               ^^\n"

tests/expectations/compiler/compiler/records/init_expression_var_fail.out

@@ -0,0 +1,5 @@
+---
+namespace: Compile
+expectation: Fail
+outputs:
+  - "Error [ETYC0372005]: Unknown circuit member variable `owner`\n    --> compiler-test:5:5\n     |\n   5 |     owner: address,\n     |     ^^^^^\n"

tests/expectations/compiler/compiler/records/no_owner_fail.out

@@ -0,0 +1,5 @@
+---
+namespace: Compile
+expectation: Fail
+outputs:
+  - "Error [ETYC0372023]: The `record` type requires the variable `owner: address`.\n    --> compiler-test:4:1\n     |\n   4 | record Token {\n   5 |     // The Aleo balance (in gates).\n   6 |     balance: u64,\n   7 |     // The token amount.\n   8 |     amount: u64,\n   9 | }\n     | ^\n"

tests/expectations/compiler/compiler/records/owner_wrong_ty.out

@@ -0,0 +1,5 @@
+---
+namespace: Compile
+expectation: Fail
+outputs:
+  - "Error [ETYC0372024]: The field `owner` in a `record` must have type `address`.\n    --> compiler-test:4:1\n     |\n   4 | record Token {\n   5 |     balance: u64,\n   6 |     owner: bool,\n   7 | }\n     | ^\n"

tests/expectations/compiler/compiler/statements/duplicate_variable.out

@@ -2,4 +2,4 @@
 namespace: Compile
 expectation: Fail
 outputs:
-  - "Error [EAST0372016]: variable `x` shadowed by\n    --> compiler-test:5:4\n     |\n   5 |   \tlet x: bool = true;\n     |    ^^^^^^^^^^^^^^^^^^\n"
+  - "Error [EAST0372017]: variable `x` shadowed by\n    --> compiler-test:5:4\n     |\n   5 |   \tlet x: bool = true;\n     |    ^^^^^^^^^^^^^^^^^^\n"