Consider the following grammar:

grammar hidden_test;

list: VAR_ ( ',' VAR_ )* ;
VAR_: '$' [a-zA-Z0-9][a-zA-Z0-9_-]* ;

WS : [ \t\r\n]+ -> channel(HIDDEN) ;

Parsing " $abc, $def" in Java or on http://lab.antlr.org/ produces the expected parse tree. But trying to parse this string in Rust via parser.list() produces the following error instead:

line 1:0 extraneous input ' ' expecting VAR_