rustc_driver: Catch ICEs on the main thread too
#48575 introduced an optimization to run rustc directly on the main thread when possible. However, the threaded code detects panics when they `join()` to report as an ICE. When running directly, we need to use `panic::catch_unwind` to get the same effect.
cc @ishitatsuyuki
r? @alexcrichton
Added warning for unused arithmetic expressions
The compiler now displays a warning when a binary arithmetic operation is evaluated but not used. This resolves#50124 by following the instructions outlined in the issue. The changes are as follows:
- Added new pattern matching for unused arithmetic expressions in `src/librustc_lint/unused.rs`
- Added `#[must_use]` attributes to the binary operation methods in `src/libcore/internal_macros.rs`
- Added `#[must_use]` attributes to the non-assigning binary operators in `src/libcore/ops/arith.rs`
Access individual fields of tuples, closures and generators on drop.
Fixes#48623, by extending the change in #47917 to closures. Also does this for tuples and generators for consistency.
Enums are unchanged because there is now way to borrow `*enum.field` without borrowing `enum.field` at the moment, so any error would be reported when the enum goes out of scope. Unions aren't changed because unions they don't automatically drop their fields.
r? @nikomatsakis
rustc: Emit `uwtable` for allocator shims
This commit emits the `uwtable` attribute to LLVM for platforms that require it
for the allocator shims that we generate to ensure that they can hopefully get
unwound past. This is a stab in the dark at helping
https://bugzilla.mozilla.org/show_bug.cgi?id=1456150 along.
rustc: Disable threads in LLD for wasm
Upstream bug reports (rustwasm/wasm-bindgen#119) show that this may be the
culprit of odd crashes/hangs. The linker is a tiny fraction of build time anyway
right now so let's disable it and figure out how to possibly reenable it later
if necessary.
Add some utilities to `libsyntax`
Adds a few functions to `Mark` and `Span` that I found useful in an upcoming refactor of NLL region error reporting. Also includes some new documentation based on my discussion with @jseyfried on IRC.
r? @jseyfried
Remove hack around comparisons of i1 values (fixes#40980)
The regression test still passes without that 2 years old hack. The underlying
LLVM bug has probably been fixed upstream since then.
Partial future-proofing for Box<T, A>
In some ways, this is similar to @eddyb's PR #47043 that went stale, but doesn't cover everything. Notably, this still leaves Box internalized as a pointer in places, so practically speaking, only ZSTs can be practically added to the Box type with the changes here (the compiler ICEs otherwise).
The Box type is not changed here, that's left for the future because I want to test that further first, but this puts things in place in a way that hopefully will make things easier.
Rollup of 7 pull requests
Successful merges:
- #49707 (Add "the Rustc book")
- #50222 (Bump bootstrap compiler to 2018-04-24)
- #50227 (Fix ICE with erroneous `impl Trait` in a trait impl)
- #50229 (Add setting to go to item if there is only one result)
- #50231 (Add more doc aliases)
- #50246 (Make dump_{alloc,allocs,local}() no-ops when tracing is disabled.)
- #49894 (Rename InternedString to LocalInternedString and introduce a new thread-safe InternedString)
Failed merges:
