|  | // RUN: %clang -fsyntax-only -fmacro-backtrace-limit=0 %s 2>&1 | FileCheck %s | 
|  |  | 
|  | #define FOO 1+"hi" | 
|  | #define BAR FOO | 
|  | #define BAZ BAR | 
|  | #define QUZ BAZ | 
|  | #define TAZ QUZ | 
|  | #define ABA TAZ | 
|  | #define BAB ABA | 
|  | #define ZAZ BAB | 
|  | #define WAZ ZAZ | 
|  | #define DROOL WAZ | 
|  | #define FOOL DROOL | 
|  |  | 
|  | FOOL; | 
|  |  | 
|  | // CHECK: :15:1: error: expected identifier or '(' | 
|  | // CHECK: FOOL | 
|  | // CHECK: ^ | 
|  | // CHECK: :13:14: note: expanded from macro 'FOOL' | 
|  | // CHECK: #define FOOL DROOL | 
|  | // CHECK:              ^ | 
|  | // CHECK: :12:15: note: expanded from macro 'DROOL' | 
|  | // CHECK: #define DROOL WAZ | 
|  | // CHECK:               ^ | 
|  | // CHECK: :11:13: note: expanded from macro 'WAZ' | 
|  | // CHECK: #define WAZ ZAZ | 
|  | // CHECK:             ^ | 
|  | // CHECK: :10:13: note: expanded from macro 'ZAZ' | 
|  | // CHECK: #define ZAZ BAB | 
|  | // CHECK:             ^ | 
|  | // CHECK: :9:13: note: expanded from macro 'BAB' | 
|  | // CHECK: #define BAB ABA | 
|  | // CHECK:             ^ | 
|  | // CHECK: :8:13: note: expanded from macro 'ABA' | 
|  | // CHECK: #define ABA TAZ | 
|  | // CHECK:             ^ | 
|  | // CHECK: :7:13: note: expanded from macro 'TAZ' | 
|  | // CHECK: #define TAZ QUZ | 
|  | // CHECK:             ^ | 
|  | // CHECK: :6:13: note: expanded from macro 'QUZ' | 
|  | // CHECK: #define QUZ BAZ | 
|  | // CHECK:             ^ | 
|  | // CHECK: :5:13: note: expanded from macro 'BAZ' | 
|  | // CHECK: #define BAZ BAR | 
|  | // CHECK:             ^ | 
|  | // CHECK: :4:13: note: expanded from macro 'BAR' | 
|  | // CHECK: #define BAR FOO | 
|  | // CHECK:             ^ | 
|  | // CHECK: :3:13: note: expanded from macro 'FOO' | 
|  | // CHECK: #define FOO 1+"hi" | 
|  | // CHECK:             ^ | 
|  |  | 
|  | #define ADD(a, b) a ## #b | 
|  | ADD(L, foo) | 
|  | // CHECK:    error: expected identifier or '(' | 
|  | // CHECK:    ADD(L, foo) | 
|  | // CHECK: {{^\^}} | 
|  | // CHECK:    note: expanded from macro 'ADD' | 
|  | // CHECK:    #define ADD(a, b) a ## #b | 
|  | // CHECK: {{^                  \^}} | 
|  | // CHECK:    note: expanded from here | 
|  | // CHECK:    L"foo" | 
|  | // CHECK: {{^\^}} | 
|  |  | 
|  | // CHECK: 2 errors generated. |