check signed ints for abs and abs.w

compiler/passes/src/type_checker/check_expressions.rs

@@ -483,12 +483,12 @@ impl<'a> ExpressionVisitorDirector<'a> for Director<'a> {
             match input.op {
                 UnaryOperation::Abs => {
                     // Assert integer type only.
-                    self.visitor.assert_int_type(destination, input.span());
+                    self.visitor.assert_singed_int_type(destination, input.span());
                     self.visit_expression(&input.receiver, destination)
                 }
                 UnaryOperation::AbsWrapped => {
                     // Assert integer type only.
-                    self.visitor.assert_int_type(destination, input.span());
+                    self.visitor.assert_singed_int_type(destination, input.span());
                     self.visit_expression(&input.receiver, destination)
                 }
                 UnaryOperation::Double => {

compiler/passes/src/type_checker/checker.rs

@@ -45,6 +45,14 @@ const INT_TYPES: [Type; 10] = [
     Type::IntegerType(IntegerType::U128),
 ];
 
+const SIGNED_INT_TYPES: [Type; 5] = [
+    Type::IntegerType(IntegerType::I8),
+    Type::IntegerType(IntegerType::I16),
+    Type::IntegerType(IntegerType::I32),
+    Type::IntegerType(IntegerType::I64),
+    Type::IntegerType(IntegerType::I128),
+];
+
 const MAGNITUDE_TYPES: [Type; 3] = [
     Type::IntegerType(IntegerType::U8),
     Type::IntegerType(IntegerType::U16),
@@ -227,6 +235,11 @@ impl<'a> TypeChecker<'a> {
         self.assert_one_of_types(type_, &INT_TYPES, span)
     }
 
+    /// Emits an error to the handler if the given type is not a signed integer.
+    pub(crate) fn assert_singed_int_type(&self, type_: &Option<Type>, span: Span) {
+        self.assert_one_of_types(type_, &SIGNED_INT_TYPES, span)
+    }
+
     /// Emits an error to the handler if the given type is not a magnitude (u8, u16, u32).
     pub(crate) fn assert_magnitude_type(&self, type_: &Option<Type>, span: Span) {
         self.assert_one_of_types(type_, &MAGNITUDE_TYPES, span)

leo/span/src/symbol.rs

@@ -146,7 +146,6 @@ symbols! {
     hash,
     ped64: "Pedersen64",
     ped128: "Pedersen128",
-    prf,
     psd2: "Poseidon2",
     psd4: "Poseidon4",
     psd8: "Poseidon8",