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Build Identifier: 20100617-1415 In the case of an optional group containing no "relevant element", parse tree reconstruction fails. The section treating "Group" || "UnorderedGroup" should probably return null if no "lastChild" is found (as does e.g. the section treating Alternatives). Reproducible: Always Steps to Reproduce: 1. Introduce something like ( '(' INT ')' )? into a rule, test parse tree reconstruction 2. 3.
I cannot reproduce the with rules like Model: foo=ID ('(' INT ')')?; or Model: foo=ID | ('(' INT ')')?; because here the section for Groups and UnorderedGroups is never called because the caller checks in advance if a group contains a relevant element. I can reproduce the behavior this rule: Model: ('(' INT ')')?; However, this is a datatype-rule and therefore the concrete syntax constraint provider is not responsible for it. It's a datatype rule because it doesn't contain an assignment. Could you provide more details how you ran into this problem?
The bug could be reproduced with the following rule: Model: ('(' INT ')') a=STRING b=STRING; Fixed in master and Helios_Maintenance.
Closing all bugs that were set to RESOLVED before Neon.0
