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authorbors <bors@rust-lang.org>2020-07-30 12:52:41 +0000
committerbors <bors@rust-lang.org>2020-07-30 12:52:41 +0000
commit21867225a74d3b07c2b65e32c67f45197db36896 (patch)
treef903229ee97368d43dac57f42e536ba2a4d9b102 /src/rustllvm/RustWrapper.cpp
parent1ce0cf070e0f5c1157976fc1106eded67bac2050 (diff)
parent88fd4943a65fe7b18c0468255c54f9dee591dd1b (diff)
downloadrust-21867225a74d3b07c2b65e32c67f45197db36896.tar.gz
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Auto merge of #74930 - ecstatic-morse:const-size-align-of-val, r=oli-obk
Make `mem::size_of_val` and `mem::align_of_val` unstably const

Implements #46571 but does not stabilize it. I wanted this while working on something today.

The only reason not to immediately stabilize are concerns around [custom DSTs](https://github.com/rust-lang/rust/issues/46571#issuecomment-387669352). That proposal has made zero progress in the last two years and const eval is rich enough to support pretty much any user-defined `len` function as long as nightly features are allowed (`raw_ptr_deref`).

Currently, this raises a `const_err` lint when passed an `extern type`.

r? @oli-obk

cc @rust-lang/wg-const-eval
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