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Simplify discriminant codegen for niche-encoded variants which don't wrap across an integer boundary

perf-regressionPerformance regression.Performance regression.

perf-regression-triagedThe performance regression has been triaged.The performance regression has been triaged.

S-waiting-on-reviewStatus: Awaiting review from the assignee but also interested parties.Status: Awaiting review from the assignee but also interested parties.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open (in progress).

rust-lang/rustnumber 143784

#143784 In rust-lang/rust;

· scottmcm opened on Jul 11, 2025

Implement RFC 3349, mixed utf8 literals

A-testsuiteArea: The testsuite used to check the correctness of rustcArea: The testsuite used to check the correctness of rustc

perf-regressionPerformance regression.Performance regression.

perf-regression-triagedThe performance regression has been triaged.The performance regression has been triaged.

T-bootstrapRelevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

T-langRelevant to the language teamRelevant to the language team

Status: Draft (not ready).

rust-lang/rustnumber 120286

#120286 In rust-lang/rust;

· nnethercote opened on Jan 23, 2024