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Language

C++

Compiler

gcc HEAD 11.0.0 20200908 (experimental)

Options
Warnings
Boost 1.73.0
C++2a(GNU)
no pedantic

$ g++ prog.cc -Wall -Wextra -I/opt/wandbox/boost-1.73.0/gcc-head/include -std=gnu++2a
prog.cc:9:14: error: macro "test" requires 2 arguments, but only 1 given
    9 |    a = test(b);   // C4003
      |              ^
prog.cc:3: note: macro "test" defined here
    3 | #define test(a,b) (a+b)
      | 
prog.cc: In function 'int main()':
prog.cc:9:8: error: 'test' was not declared in this scope
    9 |    a = test(b);   // C4003
      |        ^~~~
Exit Code:
1