llvm-project/clang/test/Analysis/uninit-vals-union.c

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// RUN: %clang_cc1 -analyze -analyzer-checker=core.builtin -analyzer-store=region -verify -Wno-unused %s
typedef union {
int y;
} U;
typedef struct { int x; } A;
void foo() {
U u = {};
A *a = &u; // expected-warning{{incompatible pointer types}}
a->x; // no-crash
}