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Restrict usages of type variables in non-generalized contexts

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Type variables can only be used on functions (and in number literals as
a carve-out for now). In all other cases, a type variable takes on a
single, concrete type based on later usages. This check emits errors
when this is violated.

The implementation is to check the rank of a variable after it could be
generalized. If the variable is not generalized but annotated as a type
variable, emit an error.
This commit is contained in:
Ayaz Hafiz 2025-01-02 14:26:37 -06:00
parent f5961cbb22
commit a0461679dd
13 changed files with 230 additions and 114 deletions
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6
crates/compiler/lower_params/src/type_error.rs
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@ -105,7 +105,8 @@ pub fn remove_module_param_arguments(
| TypeError::ExpectedEffectful(_, _)
| TypeError::UnsuffixedEffectfulFunction(_, _)
| TypeError::SuffixedPureFunction(_, _)
| TypeError::InvalidTryTarget(_, _, _) => {}
| TypeError::InvalidTryTarget(_, _, _)
| TypeError::TypeIsNotGeneralized(..) => {}
}
}
}
@ -213,6 +214,7 @@ fn drop_last_argument(err_type: &mut ErrorType) {
| ErrorType::Alias(_, _, _, _)
| ErrorType::Range(_)
| ErrorType::Error
| ErrorType::EffectfulFunc => {}
| ErrorType::EffectfulFunc
| ErrorType::InferenceVar => {}
}
}