Compiling Grammar.rsc gives a compiler error.

[PaulKlint]

Compiling Grammar.rsc gives a compiler error:

rascal>compile(|rascal:///Grammar.rsc|, recompile=true);
...
r2mu: Compiling grammar
r2mu: Compiling compose
Rebuilding visit!
|rascal://lang::rascal::types::AbstractType|(21233,2,<435,70>,<435,72>): "tupleHasFieldNames given non-Tuple type Production"
    at tupleHasFieldNames(|rascal://experiments::Compiler::Rascal2muRascal::RascalExpression|(21600,2,<501,26>,<501,28>))

[Anastassija]

This is a problem of handling the field-update expressions by the compiler, the following example also crashes:

data A = a(str field);

value main(list[value] args) { 
    return a("1")[field = "2"];
}

...
r2mu: Compiling main
adt("A",[])
|rascal://lang::rascal::types::AbstractType|(21233,2,<435,70>,<435,72>): "tupleHasFieldNames given non-Tuple type A"
    at tupleHasFieldNames(|rascal://experiments::Compiler::Rascal2muRascal::RascalExpression|(21669,2,<503,26>,<503,28>))

[PaulKlint]

@Anastassija thanks for your analysis. It just happens that I solved this problem in commit caf33da and Grammar.rsc now compiles ok.