can't leave intellij parser in rule that matches to a "more" operation. Remove + from the loop in ARG action and i got rid of errors like:
2014-07-16 18:10:37,038 [  40754]  ERROR - enapi.editor.impl.DocumentImpl - Wrong offset: 45. Should be in range: [0, 38] Lexer: org.antlr.intellij.plugin.adaptors.ANTLRv4LexerAdaptor@5f9ab2da
java.lang.IndexOutOfBoundsException: Wrong offset: 45. Should be in range: [0, 38] Lexer: org.antlr.intellij.plugin.adaptors.ANTLRv4LexerAdaptor@5f9ab2da
	at com.intellij.openapi.editor.ex.util.LexerEditorHighlighter.documentChanged(LexerEditorHighlighter.java:162)