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[mypyc] Support ellipsis (...) expressions in class bodies #17923

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Oct 14, 2024
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5 changes: 4 additions & 1 deletion mypyc/irbuild/classdef.py
Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,7 @@
CallExpr,
ClassDef,
Decorator,
EllipsisExpr,
ExpressionStmt,
FuncDef,
Lvalue,
Expand Down Expand Up @@ -145,7 +146,9 @@ def transform_class_def(builder: IRBuilder, cdef: ClassDef) -> None:
continue
with builder.catch_errors(stmt.line):
cls_builder.add_method(get_func_def(stmt))
elif isinstance(stmt, PassStmt):
elif isinstance(stmt, PassStmt) or (
isinstance(stmt, ExpressionStmt) and isinstance(stmt.expr, EllipsisExpr)
):
continue
elif isinstance(stmt, AssignmentStmt):
if len(stmt.lvalues) != 1:
Expand Down
18 changes: 17 additions & 1 deletion mypyc/test-data/run-classes.test
Original file line number Diff line number Diff line change
Expand Up @@ -3,20 +3,36 @@ class Empty: pass

def f(e: Empty) -> Empty:
return e

class EmptyEllipsis: ...

def g(e: EmptyEllipsis) -> EmptyEllipsis:
return e
[file driver.py]
from native import Empty, f
from native import Empty, EmptyEllipsis, f, g

print(isinstance(Empty, type))
print(Empty)
print(str(Empty())[:20])

e = Empty()
print(f(e) is e)

print(isinstance(EmptyEllipsis, type))
print(EmptyEllipsis)
print(str(EmptyEllipsis())[:28])

e2 = EmptyEllipsis()
print(g(e2) is e2)
[out]
True
<class 'native.Empty'>
<native.Empty object
True
True
<class 'native.EmptyEllipsis'>
<native.EmptyEllipsis object
True

[case testClassWithFields]
class C:
Expand Down
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