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feat: add CastExpr support to constant_fold_expr [1/1] #19983

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feat: add CastExpr support to constant_fold_expr [1/1] #19983

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70fa984
[mypyc] feat: add CastExpr support to `constant_fold_expr`
BobTheBuidler Oct 2, 2025
2d177e9
Update constant_fold.py
BobTheBuidler Oct 2, 2025
a8f50ce
Update expression.py
BobTheBuidler Oct 3, 2025
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3 changes: 3 additions & 0 deletions mypy/constant_fold.py
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@
from typing import Final, Union

from mypy.nodes import (
CastExpr,
ComplexExpr,
Expression,
FloatExpr,
Expand Down Expand Up @@ -73,6 +74,8 @@ def constant_fold_expr(expr: Expression, cur_mod_id: str) -> ConstantValue | Non
value = constant_fold_expr(expr.expr, cur_mod_id)
if value is not None:
return constant_fold_unary_op(expr.op, value)
elif isinstance(expr, CastExpr):
return constant_fold_expr(expr.expr, cur_mod_id)
return None


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3 changes: 3 additions & 0 deletions mypyc/irbuild/constant_fold.py
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@
from mypy.constant_fold import constant_fold_binary_op, constant_fold_unary_op
from mypy.nodes import (
BytesExpr,
CastExpr,
ComplexExpr,
Expression,
FloatExpr,
Expand Down Expand Up @@ -72,6 +73,8 @@ def constant_fold_expr(builder: IRBuilder, expr: Expression) -> ConstantValue |
value = constant_fold_expr(builder, expr.expr)
if value is not None and not isinstance(value, bytes):
return constant_fold_unary_op(expr.op, value)
elif isinstance(expr, CastExpr):
return constant_fold_expr(builder, expr.expr)
return None


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