Frog: internal error after undiagnosed syntax error

[rakudrama]

Compiling this program:

main() {
  Expect.equ als(10, 10);
}

Gives:

$ frogsh --enable_type_checks bug1n.dart

node.js:134
        throw e; // process.nextTick error, or 'error' event on first tick
        ^
TypeError: Object #<MethodGenerator> has no method 'visitDeclaredIdentifier'
    at DeclaredIdentifier.visit (/usr/local/google/home/sra/dart-all/dart/frog/frogsh:20230:18)
    at MethodGenerator.visitCallExpression (/usr/local/google/home/sra/dart-all/dart/frog/frogsh:13051:26)
    at CallExpression.visit (/usr/local/google/home/sra/dart-all/dart/frog/frogsh:19750:18)
    at MethodGenerator.visitValue (/usr/local/google/home/sra/dart-all/dart/frog/frogsh:12566:20)
    at MethodGenerator.visitVoid (/usr/local/google/home/sra/dart-all/dart/frog/frogsh:12579:15)
    at MethodGenerator.visitExpressionStatement (/usr/local/google/home/sra/dart-all/dart/frog/frogsh:12968:20)
    at lang_ExpressionStatement.visit (/usr/local/google/home/sra/dart-all/dart/frog/frogsh:19676:18)
    at lang_ExpressionStatement.visit$1 (/usr/local/google/home/sra/dart-all/dart/frog/frogsh:19679:15)
    at MethodGenerator.visitStatementsInBlock (/usr/local/google/home/sra/dart-all/dart/frog/frogsh:12540:12)
    at MethodGenerator.writeBody (/usr/local/google/home/sra/dart-all/dart/frog/frogsh:12478:8)

[DartBot]

This comment was originally written by jimhug@google.com

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Set owner to jimhug@google.com.
Added Started label.

[DartBot]

This comment was originally written by jimhug@google.com

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http://codereview.chromium.org/8678011

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Added Fixed label.