b9be3c47e5
Stabilize Wasm target features that are in phase 4 and 5
This stabilizes the Wasm target features that are known to be working and in [phase 4 and 5](04fa8c810e).
Feature stabilized:
- [Non-trapping float-to-int conversions](https://github.com/WebAssembly/nontrapping-float-to-int-conversions)
- [Import/Export of Mutable Globals](https://github.com/WebAssembly/mutable-global)
- [Sign-extension operators](https://github.com/WebAssembly/sign-extension-ops)
- [Bulk memory operations](https://github.com/WebAssembly/bulk-memory-operations)
- [Extended Constant Expressions](https://github.com/WebAssembly/extended-const)
Features not stabilized:
- [Multi-value](https://github.com/WebAssembly/multi-value): requires rebuilding `std` #73755.
- [Reference Types](https://github.com/WebAssembly/reference-types): no point stabilizing without #103516.
- [Threads](https://github.com/webassembly/threads): requires rebuilding `std` #77839.
- [Relaxed SIMD](https://github.com/WebAssembly/relaxed-simd): separate PR #117468.
- [Multi Memory](https://github.com/WebAssembly/multi-memory): not implemented.
See https://github.com/rust-lang/rust/pull/117457#issuecomment-1787648070 for more context.
Documentation: https://github.com/rust-lang/reference/pull/1420
Tracking issue: https://github.com/rust-lang/rust/issues/44839
UI Tests
This folder contains rustc's
UI tests.
Test Directives (Headers)
Typically, a UI test will have some test directives / headers which are special comments that tell compiletest how to build and intepret a test.
As part of an on-going effort to rewrite compiletest
(see https://github.com/rust-lang/compiler-team/issues/536), a major
change proposal to change legacy compiletest-style headers // <directive>
to ui_test-style headers
//@ <directive> was accepted (see
https://github.com/rust-lang/compiler-team/issues/512.
An example directive is ignore-test. In legacy compiletest style, the header
would be written as
// ignore-test
but in ui_test style, the header would be written as
//@ ignore-test
compiletest is changed to accept only //@ directives for UI tests
(currently), and will reject and report an error if it encounters any
comments // <content> that may be parsed as an legacy compiletest-style
test header. To fix this, you should migrate to the ui_test-style header
//@ <content>.