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/* { dg-do compile } */
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/* { dg-options "-O0" } */
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struct { int; int q; } a; /* { dg-warning "does not declare anything" } */
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struct { union {int x;}; int q; } b;
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struct { struct {int x;}; int q; } c;
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union { union {int x;}; int q; } d;
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union { struct {int x;}; int q; } e;
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