MIR borrowck: print lvalues in error messages in the same way that the AST borrowck#44985

Merged

bors merged 12 commits intorust-lang:masterfrom

zilbuz:issue-44974

Oct 12, 2017

Commits on Oct 6, 2017

mir-borrowck: print values in error messages in the same way that the AST borrowck
zilbuz
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mir-borrowck: Add tests for `describe_lvalue()`
zilbuz
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mir-borrowck: Fix existing tests
zilbuz
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mir-borrowck: Panic when trying to print a field access on a non-box type that is neither Adt nor tuple
zilbuz
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mir-borrowck: Autoderef values followed by a constant index, and fix reported lvalue for constant index
zilbuz
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mir-borrowck: Replace all constant index and sublices output with `[..]` to match the AST borrowck output
zilbuz
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mir-borrowck: Implement end-user output for field of downcast projection
zilbuz
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mir-borrowck: Implement end-user output for field of field projection
zilbuz
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mir-borrowck: Implement end-user output for field of index projection
zilbuz
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mir-borrowck: Implement end-user output for field of reference, pointer and array
zilbuz
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mir-borrowck: Append `_` or `..` depending on the context if a local variable hasn't a name
zilbuz
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mir-borrowck: Implement end-user output for field of subslice and slice type
zilbuz
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