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  1. struct Base { int a; };
  2.  
  3. union TestFails
  4. {
  5.  
  6. 	struct A : public Base {};
  7.  
  8. 	int b;
  9. };
  10.  
  11. union TestWorks
  12. {
  13. 	struct A { int a; };
  14. 	int b;
  15. };
  16.  
  17. int main()
  18. {
  19. 	TestWorks works;
  20. 	works.a = 0;
  21.  
  22. 	TestFails fails;
  23. 	fails.a = 0;
  24.  
  25. 	return 0;
  26. }
Compilation error #stdin compilation error #stdout 0s 3452KB
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stdin
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Standard input is empty
compilation info 
prog.cpp: In function 'int main()':
prog.cpp:20:8: error: 'union TestWorks' has no member named 'a'
  works.a = 0;
        ^
prog.cpp:23:8: error: 'union TestFails' has no member named 'a'
  fails.a = 0;
        ^
stdout
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Standard output is empty
https://ideone.com/dUzpOR
language:
C++ (gcc 8.3)
created:
8 years ago
visibility:
public

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