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Add PendingDef::ShadowedAlias

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This commit is contained in:
Richard Feldman 2020-04-05 17:08:53 -04:00
parent ea91f06490
commit 9cead44b39
1 changed files with 14 additions and 9 deletions
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23
compiler/can/src/def.rs
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@ -71,6 +71,8 @@ enum PendingDef<'a> {
vars: Vec<Located<Lowercase>>,
ann: &'a Located<ast::TypeAnnotation<'a>>,
},
ShadowedAlias,
}
#[derive(Clone, Debug, PartialEq)]
@ -853,6 +855,11 @@ fn canonicalize_pending_def<'a>(
.introduced_variables
.union(&can_ann.introduced_variables);
}
ShadowedAlias => {
// Since this alias was shadowed, it gets ignored and has no
// effect on the output.
}
TypedBody(loc_pattern, loc_can_pattern, loc_ann, loc_expr) => {
let ann =
canonicalize_annotation(env, scope, &loc_ann.value, loc_ann.region, var_store);
@ -1290,6 +1297,7 @@ fn to_pending_def<'a>(
Alias { name, vars, ann } => {
let region = Region::span_across(&name.region, &ann.region);
match scope.introduce(
name.value.into(),
&env.exposed_ident_ids,
@ -1326,16 +1334,13 @@ fn to_pending_def<'a>(
}
}
Err((original_region, shadow)) => {
// env.problem(Problem::ShadowingInAnnotation {
// original_region,
// shadow,
// });
Err((original_region, loc_shadowed_symbol)) => {
env.problem(Problem::ShadowingInAnnotation {
original_region,
shadow: loc_shadowed_symbol,
});
panic!(
"TODO gracefully handle shadowing of type alias {:?}",
(original_region, shadow)
)
PendingDef::ShadowedAlias
}
}
}