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Make X[()] count as a type application #20568

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Merged
hauntsaninja merged 2 commits into from
Jan 12, 2026
Merged

Make X[()] count as a type application #20568

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88e3871
Make `X[()]` count as a type application
A5rocks Jan 12, 2026
536ffd8
Add extra tests for empty TypeVarTuples
A5rocks Jan 12, 2026
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4 changes: 3 additions & 1 deletion mypy/typeanal.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2533,7 +2533,9 @@ def validate_instance(t: Instance, fail: MsgCallback, empty_tuple_index: bool) -
arg_count = len(t.args)
min_tv_count = sum(not tv.has_default() for tv in t.type.defn.type_vars)
max_tv_count = len(t.type.type_vars)
if arg_count and (arg_count < min_tv_count or arg_count > max_tv_count):
if (arg_count or empty_tuple_index) and (
arg_count < min_tv_count or arg_count > max_tv_count
):
fail(
wrong_type_arg_count(min_tv_count, max_tv_count, str(arg_count), t.type.name),
t,
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8 changes: 8 additions & 0 deletions test-data/unit/check-generics.test
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Expand Up @@ -3622,3 +3622,11 @@ t2.foo = [B()]
t2.foo = [C()]
t2.foo = [1] # E: Value of type variable "T" of "foo" of "Test" cannot be "int"
[builtins fixtures/property.pyi]

[case testMissingTypeArgsInApplication]
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x: list[()] = [] # E: "list" expects 1 type argument, but none given

[case testMissingTypeArgsInApplicationStrict]
# flags: --strict
x: list[()] = [] # E: "list" expects 1 type argument, but none given \
# E: Missing type arguments for generic type "list"
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