llvm-project/clang/test/SemaObjC/ivar-ref-misuse.m

// RUN: %clang_cc1 -fsyntax-only -verify %s

@interface Sprite { // expected-note{{'Sprite' declared here}}
  int sprite, spree;
  int UseGlobalBar;
}
+ (void)setFoo:(int)foo;
+ (void)setSprite:(int)sprite;
- (void)setFoo:(int)foo;
- (void)setSprite:(int)sprite;
@end

int spree = 23;
int UseGlobalBar;

@implementation Sprite
+ (void)setFoo:(int)foo {
  sprite = foo;   // expected-error {{instance variable 'sprite' accessed in class method}}
  spree = foo;
  Xsprite = foo; // expected-error {{unknown type name 'Xsprite'; did you mean 'Sprite'?}}  \
  // expected-error{{expected identifier or '('}}
  UseGlobalBar = 10;
}
+ (void)setSprite:(int)sprite {
  int spree;
  sprite = 15;
  spree = 17;
  ((Sprite *)self)->sprite = 16;   /* NB: This is how one _should_ access */
  ((Sprite *)self)->spree = 18;    /* ivars from within class methods!    */
}
- (void)setFoo:(int)foo {
  sprite = foo;
  spree = foo;
}
- (void)setSprite:(int)sprite {
  int spree;
  sprite = 15;  // expected-warning {{local declaration of 'sprite' hides instance variable}}
  self->sprite = 16;
  spree = 17;  // expected-warning {{local declaration of 'spree' hides instance variable}}
  self->spree = 18;
}   
@end