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Rollup merge of rust-lang#111708 - jyn514:delay-span-bug-msg, r=compi…
…ler-errors Give a more useful location for where a span_bug was delayed Before: ``` = note: delayed at 0: <rustc_errors::HandlerInner>::emit_diagnostic at ./compiler/rustc_errors/src/lib.rs:1335:29 1: <rustc_errors::Handler>::emit_diagnostic at ./compiler/rustc_errors/src/lib.rs:1124:9 ... ``` After: ``` = note: delayed at compiler/rustc_parse/src/parser/diagnostics.rs:2158:28 0: <rustc_errors::HandlerInner>::emit_diagnostic at ./compiler/rustc_errors/src/lib.rs:1335:29 1: <rustc_errors::Handler>::emit_diagnostic at ./compiler/rustc_errors/src/lib.rs:1124:9 ... ``` This both makes the relevant frame easier to find without having to dig through diagnostic internals, and avoids the weird-looking formatting for the first frame. Found while working on rust-lang#111529.
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