Dangly paths#17

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pnkfelix wants to merge 8 commits intonikomatsakis:masterfrom

pnkfelix:dangly-paths

Commits on Sep 12, 2017

Encoded versions of dangly-path examples.
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Refactoring: cloned old `fn check_move` method to `fn check_drop`,
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Added `impl fmt::Display for Path` so path formats can resemble source code.
pnkfelix
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Switch to `fmt::Display` formatting of paths in errors emitted by check_drop.
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Factor out a `StructDecl::field_decl` method for `FieldDecl` lookup.
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`fmt::Display` impl for `StructName` that just writes name (like `RegionName` and `FieldName`).
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A fixme to investigate in the future.
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The actual dangly-path analysis.
pnkfelix
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