map literals not considered constant

[DartBot]

This issue was originally filed by waqn...@gmail.com

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What steps will reproduce the problem?
try to compile

class foo {
  Map m1 = {};
  Map m2 = { "foo": 1 };
}

What is the expected output? What do you see instead?
I would expect a class with two fields with const initializers.

Instead, I get two errors about the map literals not being constant literals.

What version of the product are you using? On what operating system?
current try-dart-lang

[floitschG]

You have to make the map-literals const:
class foo {
  Map m1 = const {};
  Map m2 = const { "foo": 1 };
}

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Added Invalid label.