Failure to error on redefinition of variable as function

[GabrielRavier]

int foo;
void foo();

On GCC, this gives:

test.c:2:6: error: ‘foo’ redeclared as different kind of symbol
    2 | void foo() {}
      |      ^~~
test.c:1:5: note: previous declaration of ‘foo’ with type ‘int’
    1 | int foo;
      |     ^~~

cwj compiles the file without an error when it probably should error (it already errors if, say, the second declaration is char foo;, so it seems easy to do this with a function redefinition too)