source: tests/array-collections/symtab-collision.cfa@ f54e6ec

// A white-box case.

// Array dimension hoisting (gen-init, just before resolver) is the earliest pass that uses a
// with-identifiers symbol table, so early that it's premature to have the symbol table report
// on name collisions/inconsistencies, and so the symbol table runs in a mode that ignores them.

// This test exercises a dimention-hoisting symbol-table query that retrieves an inconsistently
// defined identifier.  This fact can be verified manually in gdb by observing a call to
// SymbolTable.cpp's OnFindError (during an addId call with key `collide_me`) that returns
// without throwing an exception, followed by a lookupId call with key `collide_me`.

// The (black-box obvious) expected outcome is that cfa-cc rejects the input program on account
// of the inconsistent identifier.

// The (white-box) relevance of achieving this outcome is the demonstration that an early ignorred
// name collision leaves the compiler in a valid-enough state to reach the later collision
// detection, without implementation shotcuts like, "Which, if either, declaration gets
// ignorred?" becoming relevant.

// This test is unrelated to _why_ the dimension-hoising pass needs to disable symbol-table
// validation; linking/manging/anon is such a case.

extern "C" {
    const long long unsigned collide_me = 42;
    const long      unsigned collide_me = 17;
}

int main() {
    float a[collide_me];
}