Unexpected Ambiguity Error (":?" vs "visit")

asked Jan 05

Hossein
81 ● 8 ● 20

updated Jan 06

Anyone here knows why Rascal produces the error message at the P.S. for the following code:

public Exp subst(Exp e, str arg, var(replacement)) { //line 54
  return (arg notin fv(e))? e: visit (e) {
    case app(ee, arg) => app(ee, replacement)
    case var(arg) => var(replacement)
  };
}

It looks to be like this is an internal bug; perhaps the relative precedence between ?: and visit is not well-defined?

P.S.

rascal>subst(lam("z", var("z")), "z", var("t"));
Unexpected ambiguity at |project://Hossein/src/ExpAbstractSyntax.rsc|(1615,121,<55,9>,<58,3>): "amb({appl(prod(label(\"IfDefinedOtherwise\",sort(\"Expression\")),[label(\"lhs\",sort(\"Expression\")),layouts(\"LAYOUTLIST\"),lit(\"?\"),layouts(\"LAYOUTLIST\"),label(\"rhs\",sort(\"Expression\"))],{assoc(\\non-assoc())}),[appl(prod(label(\"Bracket\",sort(\"Expression\")),[lit(\"(\"),layouts(\"LAYOUTLIST\"),label(\"expression\",sort(\"Expression\")),layouts(\"LAYOUTLIST\"),lit(\")\")],{bracket()}),[appl(prod(lit(\"(\"),[\\char-class([range(40,40)])],{}),[char(40)]),appl(prod(layouts(\"LAYOUTLIST\"),[conditional(\\iter-star(lex(\"LAYOUT\")),{\\not-follow(\\char-class([range(9,10),range(13,13),range(32,32)])),\\not-follow(lit(\"//\")),\\not-follow(lit(\"/*\"))})],{}),[appl(regular(\\iter-star(lex(\"LAYOUT\"))),[])[@loc=|project://Hossein/src/ExpAbstractSyntax.rsc|(1616,0,\<55,10\>,\<55,10\>)]])[@loc=|project://Hossein/src/ExpAbstractSyntax.rsc|(1616,0,\<55,10\>,\<55,10\>)],appl(prod(label(\"NotIn\",sort(\"Expression\")),[label(\"lhs\",sort(\"Expression\")),layouts(\"LAYOUTLIST\"),lit(\"notin\"),layouts(\"LAYOUTLIST\"),label(\"rhs\",sort(\"Expression\"))],{assoc(\\non-assoc())}),[appl(prod(label(\"QualifiedName\",sort(\"Expression\")),[label(\"qualifiedName\",sort(\"QualifiedName\"))],{}),[appl(prod(label(\"Default\",sort(\"QualifiedName\")),[conditional(label(\"names\",\\iter-seps(lex(\"Name\"),[layouts(\"LAYOUTLIST\"),lit(\"::\"),layouts(\"LAYOUTLIST\")])),{\\not-follow(lit(\"::\"))})],{}),[appl(regular(\\iter-seps(lex(\"Name\"),[layouts(\"LAYOUTLIST\"),lit(\"::\"),layouts(\"LAYOUTLIST\")])),[appl(prod(lex(\"Name\"),[conditional(seq([conditional(\\char-class([range(65,90),range(95,95),range(97,122)]),{\\not-precede(\\char-class([range(65,90),range(95,95),range(97,122)]))}),conditional(\\iter-star(\\char-class([range(48,57),range(65,90),range(95,95),range(97,122)])),{\\not-follow(\\char-class([range(48,57),range(65,90),range(95,95),range(97,122)]))})]),{delete(keywords(\"RascalKeywords\"))})],{}),[appl(regular(seq([conditional(\\char-class([range(65,90),range(95,95),range(97,122)]),{\\not-precede(\\char-class([range(65,90),range(95,95),range(97,122)]))}),conditional(\\iter-star(\\char-class([range(48,57),range(65,90),range(95,95),range(97,122)])),{\\not-follow(\\char-class([range(48,57),range(65,90),range(95,95),range(97,122)]))})])),[char(97),appl(regular(\\iter-star(\\char-class([range(48,57),range(65,90),range(95,95),range(97,122)]))),[char(114),char(103)])[@loc=|project://Hossein/src/ExpAbstractSyntax.rsc|(1617,2,\<55,11\>,\<55,13\>)]])[@loc=|project://Hossein/src/ExpAbstractSyntax.rsc|(1616,3,\<55,10\>,\<55,13\>)]])[@loc=|project://Hossein/src/ExpAbstractSyntax.rsc|(1616,3,\<55,10\>,\<55,13\>)]])[@loc=|project://Hossein/src/ExpAbstractSyntax.rsc|(1616,3,\<55,10\>,\<55,13\>)]])[@loc=|project://Hossein/src/ExpAbstractSyntax.rsc|(1616,3,\<55,10\>,\<55,13\>)]])[@loc=|project://Hossein/src/ExpAbstractSyntax.rsc|(1616,3,\<55,10\>,\<55,13\>)],appl(prod(layouts(\"LAYOUTLIST\"),[conditional(\\iter-star(lex(\"LAYOUT\")),{\\not-follow(\\char-class([range(9,10),range(13,13),range(32,32)])),\\not-follow(lit(\"//\")),\\not-follow(lit(\"/*\"))})],{}),[appl(regular(\\iter-star(lex(\"LAYOUT\"))),[appl(prod(lex(\"LAYOUT\"),[\\char-class([range(9,10),range(13,13),range(32,32)])],{}),[char(32)])[@loc=|project://Hossein/src/ExpAbstractSyntax.rsc|(1619,1,\<55,13\>,\<55,14\>)]])[@loc=|project://Hossein/src/ExpAbstractSyntax.rsc|(1619,1,\<55,13\>,\<55,14\>)]])[@loc=|project://Hossein/src/ExpAbstractSyntax.rsc|(1619,1,\<55,13\>,\<55,14\>)],appl(prod(lit(\"notin\"),[\\char-class([range(110,110)]),\\char-class([range(111,111)]),\\char-class([range(116,116)]),\\char-class([range(105,105)]),\\char-class([range(110,110)])],{}),[char(110),char(111),char(116),char(105),char(110)]),appl(prod(layouts(\"LAYOUTLIST\"),[conditional(\\iter-star(lex(\"LAYOUT\")),{\\not-follow(\\char-class([range(9,10),range(13,13),range(32,32)])),\\not-follow(lit(\"//\")),\\not-follow(lit(\"/*\"))})],{}),[appl(regular(\\iter-star(lex(\"LAYOUT\"))),[appl(prod(lex(\"LAYOUT\"),[\\char-class([range(9,10),range(13,13),range(32,32)])],{}),[char(32)])[@loc=|project://Hossein/src/ExpAbstractSyntax.rsc|(1625,1,\<55,19\>,\<55,20\>)]])[@loc=|project://Hossein/src/ExpAbstractSyntax.rsc|(1625,1,\<55,19\>,\<55,20\>)]])[@loc=|project://Hossein/src/ExpAbstractSyntax.rsc|(1625,1,\<55,19\>,\<55,20\>)],appl(prod(label(\"CallOrTree\",sort(\"Expression\")),[label(\"expression\",sort(\"Expression\")),layouts(\"LAYOUTLIST\"),lit(\"(\"),layouts(\"LAYOUTLIST\"),label(\"arguments\",\\iter-star-seps(sort(\"Expression\"),[layouts(\"LAYOUTLIST\"),lit(\",\"),layouts(\"LAYOUTLIST\")])),layouts(\"LAYOUTLIST\"),lit(\")\")],{}),[appl(prod(label(\"QualifiedName\",sort(\"Expression\")),[label(\"qualifiedName\",sort(\"QualifiedName\"))],{}),[appl(prod(label(\"Default\",sort(\"QualifiedName\")),[conditional(label(\"names\",\\iter-seps(lex(\"Name\"),[layouts(\"LAYOUTLIST\"),lit(\"::\"),layouts(\"LAYOUTLIST\")])),{\\not-follow(lit(\"::\"))})],{}),[appl(regular(\\iter-seps(lex(\"Name\"),[layouts(\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