Rollup of 5 pull requests #70403
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Rollup of 5 pull requests #70403
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The former `done` flag was roughly similar to an `Option` tag, but left
the possibity of misuse. By using a real `Option`, we can set `None`
when the iterator is exhausted, removing any way to call it again. We
also allow niche layout this way, so the `Fuse` may be smaller.
The `FusedIterator` specialization does want to ignore the possibility
of exhaustion though, so it uses `unsafe { intrinsics::unreachable() }`
to optimize that branch away. The entire `Fuse` implementation is now
isolated in its own module to contain that unsafety.
…rand of overflowing_signed_offset
use checked casts and arithmetic in Miri engine This is unfortunately pretty annoying because we have to cast back and forth between `u64` and `usize` more often that should be necessary, and that cast is considered fallible. For example, should [this](https://doc.rust-lang.org/nightly/nightly-rustc/rustc/mir/interpret/value/enum.ConstValue.html) really be `usize`? Also, `LayoutDetails` uses `usize` for field indices, but in Miri we use `u64` to be able to also handle array indexing. Maybe methods like `mplace_field` should be suitably generalized to accept both `u64` and `usize`? r? @oli-obk Cc @eddyb
correctly normalize constants closes rust-lang#70317 implements rust-lang#70125 (comment) r? eddyb cc @varkor
…-code-e0710, r=Dylan-DPC Add long error explanation for E0710 Add long explanation for the E0710 error code Part of rust-lang#61137 r? @GuillaumeGomez
Implement Fuse with Option
The former `done` flag was roughly similar to an `Option` tag, but left
the possibity of misuse. By using a real `Option`, we can set `None`
when the iterator is exhausted, removing any way to call it again. We
also allow niche layout this way, so the `Fuse` may be smaller.
The `FusedIterator` specialization does want to ignore the possibility
of exhaustion though, so it uses `unsafe { intrinsics::unreachable() }`
to optimize that branch away. The entire `Fuse` implementation is now
isolated in its own module to contain that unsafety.
r? @scottmcm
Update cargo. 8 commits in 7019b3ed3d539db7429d10a343b69be8c426b576..8a0d4d9c9abc74fd670353094387d62028b40ae9 2020-03-17 21:02:00 +0000 to 2020-03-24 17:57:04 +0000 - Re-implement proc-macro feature decoupling. (rust-lang/cargo#8028) - Remove unused transitive dependencies: miniz_oxide, adler32 (rust-lang/cargo#8023) - Fix bug with -Zfeatures=dev_dep and `check --profile=test`. (rust-lang/cargo#8027) - Remove Config from CompileOptions. (rust-lang/cargo#8021) - Add `rustless.org` to documented blocklist. (rust-lang/cargo#7922) - Print colored warnings when build script panics (rust-lang/cargo#8017) - Do not supply --crate-version flag to rustdoc if present in RUSTDOCFLAGS (rust-lang/cargo#8014) - Add proc-macro to index, and new feature resolver. (rust-lang/cargo#8003)
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r? @ghost