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Fix crash on star unpack in TypedDict #16116

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Sep 15, 2023
Merged

Fix crash on star unpack in TypedDict #16116

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3 changes: 1 addition & 2 deletions mypy/checkexpr.py
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Original file line number Diff line number Diff line change
Expand Up @@ -813,8 +813,7 @@ def validate_star_typeddict_item(
Note `result` and `always_present_keys` are updated in place. Return true if the
expression `item_arg` may valid in `callee` TypedDict context.
"""
with self.chk.local_type_map(), self.msg.filter_errors():
inferred = get_proper_type(self.accept(item_arg, type_context=callee))
inferred = get_proper_type(self.accept(item_arg, type_context=callee))
possible_tds = []
if isinstance(inferred, TypedDictType):
possible_tds = [inferred]
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12 changes: 12 additions & 0 deletions test-data/unit/check-typeddict.test
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Expand Up @@ -3224,3 +3224,15 @@ t2: Foo = {**y} # E: Missing key "a" for TypedDict "Foo"
t3: Foo = {**z} # E: Missing key "a" for TypedDict "Foo"
[builtins fixtures/dict.pyi]
[typing fixtures/typing-typeddict.pyi]

[case testTypedDictUnpackError]
from typing import TypedDict

class Foo(TypedDict):
a: int

def foo(x: int) -> Foo: ...

f: Foo = {**foo("no")} # E: Argument 1 to "foo" has incompatible type "str"; expected "int"
[builtins fixtures/dict.pyi]
[typing fixtures/typing-typeddict.pyi]
34 changes: 34 additions & 0 deletions test-data/unit/reports.test
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Expand Up @@ -69,6 +69,40 @@ def untyped_function():
</packages>
</coverage>

[case testCoberturaStarUnpacking]
# cmd: mypy --cobertura-xml-report build a.py
[file a.py]
from typing import TypedDict

class MyDict(TypedDict):
a: int

def foo(a: int) -> MyDict:
return {"a": a}
md: MyDict = MyDict(**foo(42))
[outfile build/cobertura.xml]
<coverage timestamp="$TIMESTAMP" version="$VERSION" line-rate="0.8333" branch-rate="0">
<sources>
<source>$PWD</source>
</sources>
<packages>
<package complexity="1.0" name="a" branch-rate="0" line-rate="0.8333">
<classes>
<class complexity="1.0" filename="a.py" name="a.py" branch-rate="0" line-rate="0.8333">
<methods/>
<lines>
<line branch="false" hits="1" number="1" precision="precise"/>
<line branch="false" hits="1" number="3" precision="precise"/>
<line branch="false" hits="0" number="4" precision="any"/>
<line branch="false" hits="1" number="6" precision="precise"/>
<line branch="false" hits="1" number="7" precision="precise"/>
<line branch="false" hits="1" number="8" precision="precise"/>
</lines>
</class>
</classes>
</package>
</packages>
</coverage>

[case testAnyExprReportDivisionByZero]
# cmd: mypy --any-exprs-report=out -c 'pass'
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