fix dangling reference in Vec::append
Turns out I forgot to enable Miri again for the Vec tests. And there was a dangling reference hiding in there! `get_unchecked_mut` is UB to call on an empty vector (there is no memory to get a reference to), and yet this code did it.
tweak discriminant on non-nullary enum diagnostic
Adds notes pointing at the non-nullary variants, and uses "custom
discriminant" language to be consistent with the Reference.
Fixes#61039.
r? @estebank
Use arenas to avoid Lrc in queries #2
The `Remove subtle Default impl for Value` makes the compilation stop due earlier due to cycle errors, since there's no longer a default value to continue the compilation with.
Based on https://github.com/rust-lang/rust/pull/59540.
Add basic CDB support to debuginfo compiletest s, to help catch `*.natvis` regressions, like those fixed in #60687.
First draft, feedback welcome.
Several Microsoft debuggers (VS, VS Code, WinDbg, CDB, ...) consume the `*.natvis` files we embed into rust `*.pdb` files. While this only tests CDB, that test coverage should help for all of them.
# Changes
## src\bootstrap
- test.rs: Run CDB debuginfo tests on MSVC targets
## src\test\debuginfo
- issue-13213.rs: CDB has trouble with this, skip for now (newly discovered regression?)
- pretty-std.rs: Was ignored, re-enable for CDB only to start with, add CDB tests.
- should-fail.rs: Add CDB tests.
## src\tools\compiletest:
- Added "-cdb" option
- Added Mode::DebugInfoCdb ("debuginfo-cdb")
- Added run_debuginfo_cdb_test[_no_opt]
- Renamed Mode::DebugInfoBoth -> DebugInfoGdbLldb ("debuginfo-gdb+lldb") since it's no longer clear what "Both" means.
- Find CDB at the default Win10 SDK install path "C:\Program Files (x86)\Windows Kits\10\Debugger\\*\cdb.exe"
- Ignore CDB tests if CDB not found.
# Issues
- `compute_stamp_hash`: not sure if there's any point in hashing `%ProgramFiles(x86)%`
- `OsString` lacks any `*.natvis` entries (would be nice to add in a followup changelist)
- DSTs (array/string slices) which work in VS & VS Code fail in CDB.
- I've avoided `Mode::DebugInfoAll` as 3 debuggers leads to pow(2,3)=8 possible combinations.
# Reference
CDB is not part of the base Visual Studio install, but can be added via the Windows 10 SDK:
https://developer.microsoft.com/en-us/windows/downloads/windows-10-sdk
Installing just "Debugging Tools for Windows" is sufficient.
CDB appears to already be installed on appveyor CI, where this changelist can find it, based on it's use here:
0ffc573110/appveyor.yml (L227)
CDB commands and command line reference:
https://docs.microsoft.com/en-us/windows-hardware/drivers/debugger/debugger-reference
syntax: Continue refactoring literals
A follow up to https://github.com/rust-lang/rust/pull/60679.
a2fd002bd5: Similarly to `EscapeError`, literal parsing now produces a `LitError`.
This way we can get rid of `diag: Option<(Span, &Handler)>` in interfaces while leaving attr/mod alone.
d9516d1120: Gathers all components of a literal token in a single struct.
