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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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2
crates/compiler/builtins/roc/Num.roc
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@ -532,7 +532,7 @@ pi = 3.14159265358979323846264338327950288419716939937510
## Circle constant (τ)
tau : Frac *
tau = 2 * pi
tau = 6.2831853071795864769252867665590057683943387987502
# ------- Functions
## Convert a number to a [Str].