1 // RUN: %clang_cc1 %s -verify
2 
3 // expected-no-diagnostics
4 
5 namespace PromotionVersusMutation {
6   typedef unsigned Unsigned;
7   typedef signed Signed;
8 
9   struct T { unsigned n : 2; } t;
10 
11   typedef __typeof__(t.n) Unsigned; // Bitfield is unsigned
12   typedef __typeof__(+t.n) Signed;  // ... but promotes to signed.
13 
14   typedef __typeof__(t.n + 0) Signed; // Arithmetic promotes.
15 
16   typedef __typeof__(t.n = 0) Unsigned;  // Assignment produces an lvalue...
17   typedef __typeof__(t.n += 0) Unsigned;
18   typedef __typeof__(t.n *= 0) Unsigned;
19   typedef __typeof__(+(t.n = 0)) Signed;  // ... which is a bit-field.
20   typedef __typeof__(+(t.n += 0)) Signed;
21   typedef __typeof__(+(t.n *= 0)) Signed;
22 
23   typedef __typeof__(++t.n) Unsigned; // Increment is equivalent to compound-assignment.
24   typedef __typeof__(--t.n) Unsigned;
25   typedef __typeof__(+(++t.n)) Signed;
26   typedef __typeof__(+(--t.n)) Signed;
27 
28   typedef __typeof__(t.n++) Unsigned; // Post-increment's result has the type
29   typedef __typeof__(t.n--) Unsigned; // of the operand...
30   typedef __typeof__(+(t.n++)) Unsigned; // ... and is not a bit-field (because
31   typedef __typeof__(+(t.n--)) Unsigned; // it's not a glvalue).
32 }
33