Un-xfail test of error message for "missing 'self'"

[catamorphism]

(Original title: More helpful error message for "missing 'self'")

The test for the improved error message was xfailed in SHA: 93d3b8a ; we want to un-xfail it.

Original bug report follows

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Currently, if I write x inside a class that has field x, and x isn't in the outer scope, the error I get is "unresolved name". I could see that being confusing. Ideally the typechecker would suggest "did you mean self.x?" if self has a field named x.

[Vincent-Belliard]

I made a pull request (#3252) which implements this feature.

[catamorphism]

Fixed in 390a31a

[catamorphism]

This doesn't work anymore, since the code that handled this for old-style classes doesn't work with impls. The test is currently xfailed.

[catamorphism]

Bumping to 0.7

[catamorphism]

Not critical for 0.7. Nominating for milestone 5, production-ready.

[graydon]

just a bug, removing milestone/nomination.

[huonw]

Visiting for triage, still an issue.

[pnkfelix]

visiting for triage, email from 2013 sep 23.