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MCP: Stabilization strategy for rustc parallel frontend

major-changeA proposal to make a major change to rustcA proposal to make a major change to rustc

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Status: Open.

#1005 In rust-lang/compiler-team;

· petrochenkov opened on Jun 23, 2026

Add testing for lint machinery at runtime

major-changeA proposal to make a major change to rustcA proposal to make a major change to rustc

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Status: Open.

#1004 In rust-lang/compiler-team;

· clubby789 opened on Jun 21, 2026

Rename the compiler files containing struct diagnostics to diagnostics.rs

final-comment-periodThe FCP has started, most (if not all) team members are in agreementThe FCP has started, most (if not all) team members are in agreement

major-changeA proposal to make a major change to rustcA proposal to make a major change to rustc

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Status: Open.

#1003 In rust-lang/compiler-team;

· JonathanBrouwer opened on Jun 17, 2026

Single-byte counter support in coverage instrumentation

final-comment-periodThe FCP has started, most (if not all) team members are in agreementThe FCP has started, most (if not all) team members are in agreement

major-changeA proposal to make a major change to rustcA proposal to make a major change to rustc

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Status: Open.

#1002 In rust-lang/compiler-team;

· woodruffw opened on Jun 15, 2026

Promote wasm32-wasip3 to Tier 2

disposition-mergeThe FCP starter wants to merge thisThe FCP starter wants to merge this

major-changeA proposal to make a major change to rustcA proposal to make a major change to rustc

proposed-final-comment-periodAn FCP has been started, cast your votes and raise concernsAn FCP has been started, cast your votes and raise concerns

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Status: Open.

#1001 In rust-lang/compiler-team;

· alexcrichton opened on Jun 12, 2026

{cwd} placeholder in --remap-path-prefix

major-changeA proposal to make a major change to rustcA proposal to make a major change to rustc

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Status: Open.

#998 In rust-lang/compiler-team;

· ashi009 opened on Jun 4, 2026

Desugar async blocks in HIR instead of MIR

final-comment-periodThe FCP has started, most (if not all) team members are in agreementThe FCP has started, most (if not all) team members are in agreement

major-changeA proposal to make a major change to rustcA proposal to make a major change to rustc

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Status: Open.

#997 In rust-lang/compiler-team;

· cjgillot opened on Jun 1, 2026

Promotes 5 Thumb-mode bare-metal Arm targets to Tier 2

disposition-mergeThe FCP starter wants to merge thisThe FCP starter wants to merge this

finished-final-comment-periodThe FCP has finished, action upon the disposition label needs to be takenThe FCP has finished, action upon the disposition label needs to be taken

major-changeA proposal to make a major change to rustcA proposal to make a major change to rustc

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Status: Open.

#985 In rust-lang/compiler-team;

· cezarbbb opened on Apr 25, 2026

group target modifier options under -T

major-changeA proposal to make a major change to rustcA proposal to make a major change to rustc

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Status: Open.

#980 In rust-lang/compiler-team;

· davidtwco opened on Mar 31, 2026

Implement LLVM-backed MC/DC instrumentation in the compiler

meeting-proposal

Status: Open.

#979 In rust-lang/compiler-team;

· RenjiSann opened on Mar 30, 2026

Promote loongarch32-unknown-none* to Tier 2

disposition-mergeThe FCP starter wants to merge thisThe FCP starter wants to merge this

finished-final-comment-periodThe FCP has finished, action upon the disposition label needs to be takenThe FCP has finished, action upon the disposition label needs to be taken

major-changeA proposal to make a major change to rustcA proposal to make a major change to rustc

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Status: Open.

#968 In rust-lang/compiler-team;

· heiher opened on Feb 13, 2026

Allow crates downstream of rustc_middle to define queries

has-concernsThere are active concernsThere are active concerns

major-changeA proposal to make a major change to rustcA proposal to make a major change to rustc

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Status: Open.

#966 In rust-lang/compiler-team;

· Zoxc opened on Feb 7, 2026