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/* Test C23 nodiscard attribute: invalid contexts. */
/* { dg-do compile } */
/* { dg-options "-std=c23 -pedantic-errors" } */
/* This attribute is not valid on types other than their definitions,
or on declarations other than function declarations, or on
statements, or as an attribute-declaration. */
[[nodiscard]]; /* { dg-error "ignored" } */
int [[nodiscard]] var; /* { dg-error "ignored" } */
int [[nodiscard ("reason")]] var2; /* { dg-error "ignored" } */
int array_with_nod_type[2] [[nodiscard]]; /* { dg-error "ignored" } */
void fn_with_nod_type () [[nodiscard]]; /* { dg-error "ignored" } */
int z = sizeof (int [[__nodiscard__]]); /* { dg-error "ignored" } */
[[nodiscard]] typedef int nod_int; /* { dg-error "can only be applied" } */
[[nodiscard]] int nvar; /* { dg-error "can only be applied" } */
struct s { int a; };
[[nodiscard]] typedef struct s nod_s; /* { dg-error "can only be applied" } */
struct t { [[nodiscard]] int b; }; /* { dg-error "can only be applied" } */
enum e { E [[nodiscard]] }; /* { dg-error "can only be applied" } */
void fx ([[nodiscard]] int p); /* { dg-error "can only be applied" } */
void
f (void)
{
int a;
[[nodiscard ("reason")]] int b = 1; /* { dg-error "can only be applied" } */
[[nodiscard]]; /* { dg-error "ignored" } */
[[nodiscard]] a = 1; /* { dg-error "ignored" } */
[[nodiscard]] label: ; /* { dg-error "can only be applied" } */
switch (var)
{
[[nodiscard]] case 1: ; /* { dg-error "can only be applied" } */
[[nodiscard]] default: ; /* { dg-error "can only be applied" } */
}
}
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