Why it does not work?

[Serhioromano]

This works if I type myname : INT;

Declarations:
    variable_name=ID  ':' variable_type=VariableType ';'
;
VariableType returns string:
    'BOOL' | 'INT'
;

This does not

Declarations:
    variable_name=ID  ':' variable_type=VariableType ';'
;
VariableType returns string:
    'BOOL' | ANY_INT
;
terminal ANY_INT: 'U'? ('S'|'D'|'L')? 'INT';

It cannot resolve

Expecting: one of these possible Token sequences:
  1. [BOOL:KW]
  2. [ANY_INT]
but found: 'INT' st(parsing-error)

[msujew]

Hey @Serhioromano,

do you already have a keyword or other terminal in your grammar which parses the INT string? Keywords are always preferred when lexing, so in case you encounter just INT, it will try to lex the INT keyword, not the ANY_INT terminal which lexes the same token.

[Serhioromano]

It was that simple! Thank you.