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rustc_symbol_mangling: support structural constants and &str in v0. This PR should unblock #85530 (except for float `const` generics, which AFAIK should've never worked). (cc `@tmiasko` could the https://github.com/rust-lang/rust/pull/85530#issuecomment-857855379 failures be retried with a quick crater "subset" run of this PR + changing the default to `v0`? Just to make sure I didn't miss anything other than the floats) The encoding is the one suggested before in e.g. https://github.com/rust-lang/rust/issues/61486#issuecomment-878932102, tho this PR won't by itself finish #61486, before closing that we'd likely want to move to `@oli-obk's` "valtrees" (i.e. #83234 and other associated work). <hr> **EDITs**: 1. switched unit/tuple/braced-with-named-fields `<const-fields>` prefixes from `"u"`/`"T"`/`""` to `"U"`/`"T"`/`"S"` to avoid the ambiguity reported by `@tmiasko` in https://github.com/rust-lang/rust/pull/87194#issuecomment-884279921. 2. `rustc-demangle` PR: https://github.com/alexcrichton/rustc-demangle/pull/55 3. RFC amendment PR: https://github.com/rust-lang/rfcs/pull/3161 * also removed the grammar changes included in that PR, from this description 4. added tests (temporarily using my fork of `rustc-demangle`) <hr> r? `@michaelwoerister` |
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