text: // RUN: clang-cc -fsyntax-only -verify -pedantic -fms-extensions=0 %s
  // RUN: clang-cc -E %s 2>&1 | grep 'blonk.c:92:2: error: #error ABC'
  // RUN: clang-cc -E %s 2>&1 | grep 'blonk.c:93:2: error: #error DEF'
  
  #line 'a'            // expected-error {{#line directive requires a positive integer argument}}
  #line 0              // expected-error {{#line directive requires a positive integer argument}}
  #line 00             // expected-error {{#line directive requires a positive integer argument}}
  #line 2147483648     // expected-warning {{C requires #line number to be less than 2147483648, allowed as extension}}
  #line 42             // ok
  #line 42 'a'         // expected-error {{invalid filename for #line directive}}
  #line 42 "foo/bar/baz.h"  // ok
  
  
  // #line directives expand macros.
  #define A 42 "foo"
  #line A
  
  # 42
  # 42 "foo"
  # 42 "foo" 2 // expected-error {{invalid line marker flag '2': cannot pop empty include stack}}
  # 42 "foo" 1 3  // enter
  # 42 "foo" 2 3  // exit
  # 42 "foo" 2 3 4 // expected-error {{invalid line marker flag '2': cannot pop empty include stack}}
  # 42 "foo" 3 4
  
  # 'a'            // expected-error {{invalid preprocessing directive}}
  # 42 'f'         // expected-error {{invalid filename for line marker directive}}
  # 42 1 3         // expected-error {{invalid filename for line marker directive}}
  # 42 "foo" 3 1   // expected-error {{invalid flag line marker directive}}
  # 42 "foo" 42    // expected-error {{invalid flag line marker directive}}
  # 42 "foo" 1 2   // expected-error {{invalid flag line marker directive}}
  
  
  // These are checked by the RUN line.
  #line 92 "blonk.c"
  #error ABC  // expected-error {{#error ABC}}
  #error DEF  // expected-error {{#error DEF}}
  
  
  // Verify that linemarker diddling of the system header flag works.
  
  # 192 "glomp.h" // not a system header.
  typedef int x;  // expected-note {{previous definition is here}}
  typedef int x;  // expected-error {{redefinition of typedef 'x' is invalid in C}}
  
  # 192 "glomp.h" 3 // System header.
  typedef int y;  // ok
  typedef int y;  // ok
  
  typedef int q;  // q is in system header.
  
  #line 42 "blonk.h"  // doesn't change system headerness.
  
  typedef int z;  // ok
  typedef int z;  // ok
  
  # 97     // doesn't change system headerness.
  
  typedef int z1;  // ok
  typedef int z1;  // ok
  
  # 42 "blonk.h"  // DOES change system headerness.
  
  typedef int w;  // expected-note {{previous definition is here}}
  typedef int w;  // expected-error {{redefinition of typedef 'w' is invalid in C}}
  
  typedef int q;  // original definition in system header, should not diagnose.
  
  // This should not produce an "extra tokens at end of #line directive" warning,
  // because #line is allowed to contain expanded tokens.
  #define EMPTY()
  #line 2 "foo.c" EMPTY( )
  #line 2 "foo.c" NONEMPTY( )  // expected-warning{{extra tokens at end of #line directive}}
  
  // PR3940
  #line 0xf  // expected-error {{#line directive requires a simple digit sequence}}
  #line 42U  // expected-error {{#line directive requires a simple digit sequence}}
  
  
  // Line markers are digit strings interpreted as decimal numbers, this is
  // 10, not 8.
  #line 010  // expected-warning {{#line directive interprets number as decimal, not octal}}
  extern int array[__LINE__ == 10 ? 1:-1];
  
  /* PR3917 */
  #line 41
  extern char array2[\
  _\
  _LINE__ == 42 ? 1: -1];  /* line marker is location of first _ */
  
  
  
  