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disable unreachable warnings in boolean ops on TypeVars with value restriction #9572

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Merged
msullivan merged 1 commit into from
Oct 18, 2020
Merged

disable unreachable warnings in boolean ops on TypeVars with value restriction #9572

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2 changes: 1 addition & 1 deletion mypy/checkexpr.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2762,7 +2762,7 @@ def check_boolean_op(self, e: OpExpr, context: Context) -> Type:
# the analysis from the semanal phase below. We assume that nodes
# marked as unreachable during semantic analysis were done so intentionally.
# So, we shouldn't report an error.
if self.chk.options.warn_unreachable:
if self.chk.should_report_unreachable_issues():
if right_map is None:
self.msg.unreachable_right_operand(e.op, e.right)

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14 changes: 14 additions & 0 deletions test-data/unit/check-unreachable-code.test
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Expand Up @@ -925,6 +925,7 @@ from typing import TypeVar, Generic

T1 = TypeVar('T1', bound=int)
T2 = TypeVar('T2', int, str)
T3 = TypeVar('T3', None, str)

def test1(x: T1) -> T1:
if isinstance(x, int):
Expand Down Expand Up @@ -961,6 +962,19 @@ class Test3(Generic[T2]):
# Same issue as above
reveal_type(self.x)


class Test4(Generic[T3]):
def __init__(self, x: T3):
# https://github.com/python/mypy/issues/9456
# On TypeVars with value restrictions, we currently have no way
# of checking a statement for all the type expansions.
# Thus unreachable warnings are disabled
if x and False:
pass
# This test should fail after this limitation is removed.
if False and x:
pass

[builtins fixtures/isinstancelist.pyi]

[case testUnreachableFlagContextManagersNoSuppress]
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