Ambiguity errors for productions annotated with a tag

[sungshik]

Describe the bug

Productions annotated with a tag (@category in the examples below, but presumably any tag) sometimes give rise to ambiguity errors.

To Reproduce

Example 1:

rascal>lexical Test1a = "0";
ok
rascal>lexical Test1b = @category="number" "0";
ok
rascal>lexical Test1c = [0];
ok
rascal>lexical Test1d = @category="number" [0];
Unexpected failure during parsing of current command: 
Ambiguous code (internal error), @category="number" [0]
org.rascalmpl.interpreter.asserts.Ambiguous: Ambiguous code (internal error), @category="number" [0]
...

Example 2:

rascal>lexical Test2a = @category="number" ([0] | [1]);
ok
rascal>lexical Test2b = @category="number" ([0-1]);
Unexpected failure during parsing of current command: 
Ambiguous code (internal error), @category="number" ([0-1])
org.rascalmpl.interpreter.asserts.Ambiguous: Ambiguous code (internal error), @category="number" ([0-1])
...
rascal>lexical Test2c = @category="number" [0-1];
Unexpected failure during parsing of current command:
Ambiguous code (internal error), @category="number" [0-1]
org.rascalmpl.interpreter.asserts.Ambiguous: Ambiguous code (internal error), @category="number" [0-1]
...

Example 3:

rascal>lexical Test3a = @category="number" ([0] | [1])+;
ok
rascal>lexical Test3b = @category="number" [0-1]+;
Unexpected failure during parsing of current command:
Ambiguous code (internal error), @category="number" [0-1]+
org.rascalmpl.interpreter.asserts.Ambiguous: Ambiguous code (internal error), @category="number" [0-1]+
...
rascal>lexical Test3c = @category="number" ([0-1]+);
ok

But:

rascal>import ParseTree;
ok
rascal>parse(#Test3c, "101");
|std:///ValueIO.rsc|(1814,205,<60,0>,<62,63>): ParseError(|unknown:///|(15,1))
        at *** somewhere ***(|std:///ValueIO.rsc|(1814,205,<60,0>,<62,63>))
        at readTextValueString(|std:///ValueIO.rsc|(1802,5,<56,37>,<56,42>))
        at mod2attr(|std:///lang/rascal/grammar/definition/Attributes.rsc|(1683,53,<37,57>,<37,110>))
        at mods2attrs(|std:///lang/rascal/grammar/definition/Attributes.rsc|(687,4,<19,66>,<19,70>))
        at prod2prod(|std:///lang/rascal/grammar/definition/Productions.rsc|(3009,78,<74,15>,<74,93>))
        at rule2prod(|std:///lang/rascal/grammar/definition/Productions.rsc|(2103,41,<53,15>,<53,56>))
        at syntax2grammar(|std:///lang/rascal/grammar/definition/Productions.rsc|(955,14,<29,14>,<29,28>))
        at modules2grammar(|std:///lang/rascal/grammar/definition/Modules.rsc|(1095,265,<24,26>,<29,38>))
        at $parsergenerator$(|main://$parsergenerator$|ok

Expected behavior

No ambiguity errors

Stack traces

Full stack trace of the ambiguity errors:

org.rascalmpl.interpreter.asserts.Ambiguous: Ambiguous code (internal error), @category="number" [0-1]*
        at org.rascalmpl.parser.uptr.UPTRNodeFactory.buildAmbiguityNode(UPTRNodeFactory.java:76)
        at org.rascalmpl.parser.uptr.UPTRNodeFactory.createAmbiguityNode(UPTRNodeFactory.java:85)
        at org.rascalmpl.parser.uptr.UPTRNodeFactory.createAmbiguityNode(UPTRNodeFactory.java:23)
        at org.rascalmpl.parser.gtd.result.out.SortContainerNodeFlattener.convertToUPTR(SortContainerNodeFlattener.java:183)
        at org.rascalmpl.parser.gtd.result.out.DefaultNodeFlattener.convert(DefaultNodeFlattener.java:63)
        at org.rascalmpl.parser.gtd.result.out.SortContainerNodeFlattener.buildAlternative(SortContainerNodeFlattener.java:90)
        at org.rascalmpl.parser.gtd.result.out.SortContainerNodeFlattener.gatherProduction(SortContainerNodeFlattener.java:65)
        at org.rascalmpl.parser.gtd.result.out.SortContainerNodeFlattener.gatherProduction(SortContainerNodeFlattener.java:71)
        at org.rascalmpl.parser.gtd.result.out.SortContainerNodeFlattener.gatherProduction(SortContainerNodeFlattener.java:71)
        at org.rascalmpl.parser.gtd.result.out.SortContainerNodeFlattener.gatherProduction(SortContainerNodeFlattener.java:71)
        at org.rascalmpl.parser.gtd.result.out.SortContainerNodeFlattener.gatherProduction(SortContainerNodeFlattener.java:71)
        at org.rascalmpl.parser.gtd.result.out.SortContainerNodeFlattener.gatherProduction(SortContainerNodeFlattener.java:71)
        at org.rascalmpl.parser.gtd.result.out.SortContainerNodeFlattener.gatherProduction(SortContainerNodeFlattener.java:71)
        at org.rascalmpl.parser.gtd.result.out.SortContainerNodeFlattener.gatherProduction(SortContainerNodeFlattener.java:71)
        at org.rascalmpl.parser.gtd.result.out.SortContainerNodeFlattener.gatherProduction(SortContainerNodeFlattener.java:71)
        at org.rascalmpl.parser.gtd.result.out.SortContainerNodeFlattener.gatherAlternatives(SortContainerNodeFlattener.java:53)
        at org.rascalmpl.parser.gtd.result.out.SortContainerNodeFlattener.convertToUPTR(SortContainerNodeFlattener.java:166)
        at org.rascalmpl.parser.gtd.result.out.DefaultNodeFlattener.convert(DefaultNodeFlattener.java:63)
        at org.rascalmpl.parser.gtd.result.out.SortContainerNodeFlattener.buildAlternative(SortContainerNodeFlattener.java:90)
        at org.rascalmpl.parser.gtd.result.out.SortContainerNodeFlattener.gatherProduction(SortContainerNodeFlattener.java:65)
        at org.rascalmpl.parser.gtd.result.out.SortContainerNodeFlattener.gatherAlternatives(SortContainerNodeFlattener.java:53)
        at org.rascalmpl.parser.gtd.result.out.SortContainerNodeFlattener.convertToUPTR(SortContainerNodeFlattener.java:166)
        at org.rascalmpl.parser.gtd.result.out.DefaultNodeFlattener.convert(DefaultNodeFlattener.java:63)
        at org.rascalmpl.parser.gtd.result.out.SortContainerNodeFlattener.buildAlternative(SortContainerNodeFlattener.java:90)
        at org.rascalmpl.parser.gtd.result.out.SortContainerNodeFlattener.gatherProduction(SortContainerNodeFlattener.java:65)
        at org.rascalmpl.parser.gtd.result.out.SortContainerNodeFlattener.gatherAlternatives(SortContainerNodeFlattener.java:53)
        at org.rascalmpl.parser.gtd.result.out.SortContainerNodeFlattener.convertToUPTR(SortContainerNodeFlattener.java:166)
        at org.rascalmpl.parser.gtd.result.out.DefaultNodeFlattener.convert(DefaultNodeFlattener.java:63)
        at org.rascalmpl.parser.gtd.result.out.SortContainerNodeFlattener.buildAlternative(SortContainerNodeFlattener.java:90)
        at org.rascalmpl.parser.gtd.result.out.SortContainerNodeFlattener.gatherProduction(SortContainerNodeFlattener.java:65)
        at org.rascalmpl.parser.gtd.result.out.SortContainerNodeFlattener.gatherProduction(SortContainerNodeFlattener.java:71)
        at org.rascalmpl.parser.gtd.result.out.SortContainerNodeFlattener.gatherProduction(SortContainerNodeFlattener.java:71)
        at org.rascalmpl.parser.gtd.result.out.SortContainerNodeFlattener.gatherAlternatives(SortContainerNodeFlattener.java:53)
        at org.rascalmpl.parser.gtd.result.out.SortContainerNodeFlattener.convertToUPTR(SortContainerNodeFlattener.java:166)
        at org.rascalmpl.parser.gtd.result.out.DefaultNodeFlattener.convert(DefaultNodeFlattener.java:63)
        at org.rascalmpl.parser.gtd.result.out.DefaultNodeFlattener.convert(DefaultNodeFlattener.java:79)
        at org.rascalmpl.parser.gtd.SGTDBF.buildResult(SGTDBF.java:1297)
        at org.rascalmpl.parser.gtd.SGTDBF.parse(SGTDBF.java:1236)
        at org.rascalmpl.parser.gtd.SGTDBF.parse(SGTDBF.java:1240)
        at org.rascalmpl.parser.gtd.SGTDBF.parse(SGTDBF.java:1252)
        at org.rascalmpl.interpreter.Evaluator.parseCommand(Evaluator.java:1023)
        at org.rascalmpl.interpreter.Evaluator.parseCommand(Evaluator.java:1013)
        at org.rascalmpl.repl.RascalInterpreterREPL.isStatementComplete(RascalInterpreterREPL.java:174)
        at org.rascalmpl.repl.BaseRascalREPL.handleInput(BaseRascalREPL.java:105)
        at org.rascalmpl.vscode.lsp.terminal.LSPTerminalREPL$1.handleInput(LSPTerminalREPL.java:281)
        at org.rascalmpl.repl.BaseREPL.handleInput(BaseREPL.java:180)
        at org.rascalmpl.repl.BaseREPL.run(BaseREPL.java:347)
        at org.rascalmpl.vscode.lsp.terminal.LSPTerminalREPL.main(LSPTerminalREPL.java:363)