llvm-project/clang/test/Sema/deref.c

// RUN: clang -fsyntax-only -verify -std=c90 %s
void
foo (void)
{
 struct b;
 struct b* x = 0;
 struct b* y = &*x;
}

void foo2 (void)
{
 typedef int (*arrayptr)[];
 arrayptr x = 0;
 arrayptr y = &*x;
}

void foo3 (void)
{
 void* x = 0;
 void* y = &*x; // expected-error{{address expression must be an lvalue or a function designator}}
}

extern const void cv1;
const void *foo4 (void)
{
  return &cv1;
}

extern void cv2;
void *foo5 (void)
{
  return &cv2; // expected-error{{address expression must be an lvalue or a function designator}}
}