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Fix constant propagation for scalar pairs #67015

Merged
merged 1 commit into from
Dec 11, 2019
Merged

Fix constant propagation for scalar pairs #67015

merged 1 commit into from
Dec 11, 2019

Commits on Dec 6, 2019

  1. const-prop: Restrict scalar pair propagation 

    We now only propagate a scalar pair if the Rvalue is a tuple with two
scalars. This for example avoids propagating a (u8, u8) value when
Rvalue has type `((), u8, u8)` (see the regression test). While this is
a correct thing to do, implementation is tricky and will be done later.

Fixes rust-lang#66971
Fixes rust-lang#66339
Fixes rust-lang#67019
    @osa1
    osa1 committed Dec 6, 2019
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