Yuan Chao Chou added the comment:
This can be repro by setting -Wshadow-compatible-local when using gcc to
compile Python-ast.c.
An example on my machine:
➜ cpython git:(69c0db5050) ✗ gcc-7 -Wshadow-compatible-local
-Wno-unused-result -Wsign-compare -Wunreachable-code -DNDEBUG -g -fwrapv -O3
-Wall -Wstrict-prototypes -I./Include -I. -I/usr/local/opt/readline/include
-I/usr/local/opt/openssl/include -I/Users/python/.pyenv/versions/3.6.1/include
-I/usr/local/include -I/Users/python/.pyenv/versions/3.6.1/include/python3.6m
-c Python/Python-ast.c -o build/temp.macosx-10.12-x86_64-3.6/Python-ast.o
Python/Python-ast.c: In function 'obj2ast_stmt':
Python/Python-ast.c:4586:25: warning: declaration of 'value' shadows a previous
local [-Wshadow=compatible-local]
expr_ty value;
^~~~~
Python/Python-ast.c:4570:17: note: shadowed declaration is here
expr_ty value;
^~~~~
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<http://bugs.python.org/issue30841>
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