M-Labs/nac3-spec
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added check for same variable

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pca006132 2020-12-17 17:21:51 +08:00 committed by pca006132
parent 57c7104bf3
commit fe6d9cc446
2 changed files with 3 additions and 0 deletions
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2
toy-impl/inference.py
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@ -32,6 +32,8 @@ def find_subst(ctx: dict[str, Type],
else: else:
if a not in b.constraints: if a not in b.constraints:
return f"{b} cannot take value of {a}" return f"{b} cannot take value of {a}"
if a == b:
return sub
if b in a.get_vars(): if b in a.get_vars():
return "Recursive type is not supported" return "Recursive type is not supported"
sub[b.name] = a sub[b.name] = a

1
toy-impl/test_subst.py
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@ -53,6 +53,7 @@ try_case(ListType(i32), ListType(i32), {})
try_case(TupleType([X, X]), TupleType([X, Y]), {}) try_case(TupleType([X, X]), TupleType([X, Y]), {})
try_case(TupleType([X, X]), TupleType([Y, Y]), {}) try_case(TupleType([X, X]), TupleType([Y, Y]), {})
try_case(TupleType([X, Y]), TupleType([X, X]), {}) try_case(TupleType([X, Y]), TupleType([X, X]), {})
try_case(TupleType([X, X]), TupleType([X, X]), {})
try_case(TupleType([X, Y]), X, {}) try_case(TupleType([X, Y]), X, {})
try_case(TupleType([i32, Y]), X, {}) try_case(TupleType([i32, Y]), X, {})