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/* { dg-do preprocess } */
/* { dg-options "-std=gnu99" { target c } } */
/* { dg-options "-std=c++20" { target c++ } } */
#define a ""
#define b(...) a ## #__VA_OPT__(1) /* { dg-error "pasting \"a\" and \"\"\"\" does not give a valid preprocessing token" } */
#define c(...) a ## #__VA_OPT__(1) /* { dg-error "pasting \"a\" and \"\"1\"\" does not give a valid preprocessing token" } */
#define d(...) #__VA_OPT__(1) ## !
#define e(...) #__VA_OPT__(1) ## !
#define f(...) #__VA_OPT__(. ## !)
#define g(...) #__VA_OPT__(. ## !)
b()
c(1)
d( ) /* { dg-error "pasting \"\"\"\" and \"!\" does not give a valid preprocessing token" } */
e( 1 ) /* { dg-error "pasting \"\"1\"\" and \"!\" does not give a valid preprocessing token" } */
f()
g(0) /* { dg-error "pasting \".\" and \"!\" does not give a valid preprocessing token" } */
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