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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