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🐛 Add a check for multiple definitions of the type alias #222

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Merged
KyrylR merged 1 commit into from
Mar 13, 2026
Merged

🐛 Add a check for multiple definitions of the type alias #222

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7 changes: 5 additions & 2 deletions src/ast.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -617,8 +617,11 @@ impl Scope {
///
/// There are any undefined aliases.
pub fn insert_alias(&mut self, name: AliasName, ty: AliasedType) -> Result<(), Error> {
let resolved_ty = self.resolve(&ty)?;
self.aliases.insert(name, resolved_ty);
if self.aliases.contains_key(&name) {
return Err(Error::RedefinedAlias(name));
}

let _ = self.aliases.insert(name, self.resolve(&ty)?);
Ok(())
}

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5 changes: 5 additions & 0 deletions src/error.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -428,6 +428,7 @@ pub enum Error {
ExpressionNotConstant,
IntegerOutOfBounds(UIntType),
UndefinedVariable(Identifier),
RedefinedAlias(AliasName),
UndefinedAlias(AliasName),
VariableReuseInPattern(Identifier),
WitnessReused(WitnessName),
Expand Down Expand Up @@ -546,6 +547,10 @@ impl fmt::Display for Error {
f,
"Variable `{identifier}` is not defined"
),
Error::RedefinedAlias(identifier) => write!(
f,
"Type alias `{identifier}` was defined multiple times"
),
Error::UndefinedAlias(identifier) => write!(
f,
"Type alias `{identifier}` is not defined"
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