gdl
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migrate to antlr 3 or antlr 4
For the record, there are some references around:
- "Migrating from ANTLR 2 to ANTLR 3": https://theantlrguy.atlassian.net/wiki/spaces/ANTLR3/pages/2687070/Migrating+from+ANTLR+2+to+ANTLR+3
- "Antlr 3 to Antlr 4 Migration Guide": https://github.com/antlr/antlr4/issues/464
- ANTLR v2 to v3 converter: http://www.antlr3.org/download/v2v3-0.2.tar.gz