foo.cc: In function 'int d(int)':
foo.cc:8:22: error: declaration of 'bool x' shadows a parameter
    8 |         }       bool x=0;
      |                      ^
foo.cc:3:11: note: 'int x' previously declared here
    3 | int d(int x)
      |       ~~~~^
foo.cc:24:1: warning: control reaches end of non-void function [-Wreturn-type]
   24 | }
      | ^

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