Some primary expressions cannot form statements

[dgrove]

r3865 (cloned from issue #1228)

The Dart spec v0.006 states that any expression can form a statement.

However, dartc yields compile error if function expression, list literal, or map literal are used as statements:

main() {
  void() g{};
  {"1" : 1, "2": 2};
  [null, 0, "O"];
}

[kasperl]

Removed Area-Compiler label.
Added Area-Analyzer label.

[bwilkerson]

Added this to the M1 milestone.
Removed Priority-Medium label.
Added Priority-Low label.

[bwilkerson]

The first case (a function literal) is still a valid problem.

The second case is no longer allowed by the spec. (see section 11.2 and issue #3777).

The third case has been fixed.

[danrubel]

Set owner to @bwilkerson.

[bwilkerson]

http://codereview.chromium.org/10823014/

Note that the example in this issue is not valid, but dartc was producing a warning that it should not have been.

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Added Fixed label.