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Implements RFC 1937: ? in main#46479

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Dec 27, 2017

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Commits on Dec 26, 2017

• Implements RFC 1937: `?` in `main`

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• avoid ICE when fields are not laid out in order

  

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• convert print-type-sizes to use `start` instead of `main`

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• Fixes compile bug caused by upstream changes

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• Fixes compilation errors and adds proposed improvements

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• Fixes tests

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• Fall back to main -> () when termination trait language item is not enabled

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• New generated main returns void

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• Fixes codegen-units tests

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• Adds termination_trait feature gate

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• Convert codegen-unit tests to use `start` instead of `main`

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• Just compare the symbol names and types, not the addresses

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• Removes some obscure transmute call in `lang_start`

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• The test functions are now in the same compile unit

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• Don't emit the termination lang item in tests

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• Use move for optimization purposes

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• Use `start` for the `sepcomp-inlining` test

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• Revert "Just compare the symbol names and types, not the addresses"

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• Rework the exit failure and success declaration for wasm32

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• Adds whitespace

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• Split `lang_start` in two functions to reduce generated code

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• Change name of `lang_start_real` to `lang_start_internal`

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• rustc: Switch `start_fn` to hidden visibility

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• Don't use `process::exit` as it is an `unreachable` on wasm32

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Commits on Dec 27, 2017

• Revert "New generated main returns void"

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