I started using Antlr today. Being cautious, I tried to write a parser
for a tiny grammar by commenting out almost everything from the online
demo and then adding my code incrementally. I got errors that can be
reduced to this grammar file:
grammar comment_test;
/** Comment 1 */
/** Comment 2 */
INT : '0'..'9'+ ;
This generated the error message:
syntax error: antlr: comment_test.g:3:1: unexpected token: /**
Comment 2 */
Changing either of the comment start characters from /** to /* makes the
error go away. It appears that Antlr will not accept back to back
comments in a grammar file if both start with /**
Larry
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