MGCA: Support literals as direct const arguments #150699

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rust-bors merged 1 commit into rust-lang:main from Human9000-bit:literals-as-direct-const-args

Jan 9, 2026

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Human9000-bit commented Jan 5, 2026

initial changes for mcga literals
rustfmt

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Human9000-bit commented Jan 5, 2026 •

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rn this is very basic changes, lots of todo!() s
took me some time to figure out what to do

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BoxyUwU left a comment •

edited by rustbot

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This is looking good already! You've touched pretty much everywhere that will be necessary for this change so it's only filling out these todo!s now :)

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compiler/rustc_hir/src/hir.rs Outdated Show resolved Hide resolved

compiler/rustc_ast_lowering/src/lib.rs Outdated Show resolved Hide resolved

compiler/rustc_hir/src/intravisit.rs Outdated

    
                      ConstArgKind::Path(qpath) => visitor.visit_qpath(qpath, *hir_id, qpath.span()),

                      ConstArgKind::Anon(anon) => visitor.visit_anon_const(*anon),

                      ConstArgKind::Error(_, _) => V::Result::output(), // errors and spans are not important

                      ConstArgKind::Literal(_, _) => todo!(),

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BoxyUwU Jan 5, 2026

In theory we should be calling visitor.visit_lit here. I don't think we actually can right now though as lots of implementers of Visitor expect that visit_lit is only called on literals inside of function bodies.

For now I think you can return the default result with V::Result::output() and leave a // FIXME(mgca) to handle const arg literals in HIR visitors at some point

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BoxyUwU mentioned this pull request

Tracking Issue for Generic Constant Arguments MVP #132980

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Human9000-bit marked this pull request as ready for review

January 6, 2026 11:35

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rustbot commented Jan 6, 2026

HIR ty lowering was modified

Some changes occurred in src/tools/clippy

cc @rust-lang/clippy

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Human9000-bit commented Jan 6, 2026

too bad I have made a merge commit

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Human9000-bit force-pushed the literals-as-direct-const-args branch from acd1271 to 78149e6 Compare

January 6, 2026 12:31

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January 6, 2026 12:31

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Human9000-bit force-pushed the literals-as-direct-const-args branch 2 times, most recently from d60c5dd to 37f084a Compare

January 6, 2026 13:05

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Human9000-bit force-pushed the literals-as-direct-const-args branch from 28fc1a0 to fafe96e Compare

January 8, 2026 15:21

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Human9000-bit force-pushed the literals-as-direct-const-args branch from fafe96e to 1d10a8f Compare

January 8, 2026 15:25

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rustbot commented Jan 8, 2026

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

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Human9000-bit commented Jan 8, 2026

@BoxyUwU we are ready to merge


          MGCA: literals support

9f3956f

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Human9000-bit commented Jan 8, 2026 •

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😅 I've noticed i named it MCGA instead of MGCA

Human9000-bit force-pushed the literals-as-direct-const-args branch from 1d10a8f to 9f3956f Compare

January 8, 2026 15:29

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BoxyUwU commented Jan 8, 2026

@bors r+ rollup

there's definitely follow up work here:

negated literals (important for isize const generics)
lit_to_const is very ICEy on wrong types and we should have proper diagnostics

so if you're interested in doing more work here that'd be very cool :)

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rust-bors bot commented Jan 8, 2026

📌 Commit 9f3956f has been approved by BoxyUwU

It is now in the queue for this repository.

matthiaskrgr added a commit to matthiaskrgr/rust that referenced this pull request


          Rollup merge of rust-lang#150699 - literals-as-direct-const-args, r=B…

bab3c6a

…oxyUwU

MGCA: Support literals as direct const arguments

Fixes [rust-lang#150168](rust-lang#150618)

- **initial changes for mcga literals**
- **rustfmt**

r? @BoxyUwU

matthiaskrgr mentioned this pull request

Rollup of 12 pull requests #150830

Closed

rust-bors bot added a commit that referenced this pull request


          Auto merge of #150830 - matthiaskrgr:rollup-x97BiJe, r=matthiaskrgr

c6f0428

Rollup of 12 pull requests

Successful merges:

 - #149961 (tidy: add if-installed prefix condition to extra checks system)
 - #150475 (std: sys: fs: uefi: Implement initial File)
 - #150533 (std: sys: fs: uefi: Implement remove_dir_all)
 - #150549 (fix missing_panics_doc in `std::os::fd::owned`)
 - #150699 (MGCA: Support literals as direct const arguments)
 - #150721 (Deprecated doc intra link)
 - #150752 (Update libc to v0.2.180)
 - #150802 (Minor cleanups to fn_abi_new_uncached)
 - #150803 (compiler-builtins subtree update)
 - #150809 (Update `literal-escaper` version to `0.0.7`)
 - #150811 (Store defids instead of symbol names in the aliases list)
 - #150825 (Query associated_item_def_ids when needed)

r? @ghost

matthiaskrgr added a commit to matthiaskrgr/rust that referenced this pull request


          Rollup merge of rust-lang#150699 - literals-as-direct-const-args, r=B…

5a3e316

…oxyUwU

MGCA: Support literals as direct const arguments

Fixes [rust-lang#150168](rust-lang#150618)

- **initial changes for mcga literals**
- **rustfmt**

r? @BoxyUwU

matthiaskrgr mentioned this pull request

Rollup of 11 pull requests #150832

Closed

matthiaskrgr added a commit to matthiaskrgr/rust that referenced this pull request


          Rollup merge of rust-lang#150699 - literals-as-direct-const-args, r=B…

1a5ba32

…oxyUwU

MGCA: Support literals as direct const arguments

Fixes [rust-lang#150168](rust-lang#150618)

- **initial changes for mcga literals**
- **rustfmt**

r? @BoxyUwU

matthiaskrgr mentioned this pull request

Rollup of 10 pull requests #150837

Closed

matthiaskrgr added a commit to matthiaskrgr/rust that referenced this pull request


          Rollup merge of rust-lang#150699 - literals-as-direct-const-args, r=B…

2b8d954

…oxyUwU

MGCA: Support literals as direct const arguments

Fixes [rust-lang#150168](rust-lang#150618)

- **initial changes for mcga literals**
- **rustfmt**

r? @BoxyUwU

matthiaskrgr added a commit to matthiaskrgr/rust that referenced this pull request


          Rollup merge of rust-lang#150699 - literals-as-direct-const-args, r=B…

eb4256d

…oxyUwU

MGCA: Support literals as direct const arguments

Fixes [rust-lang#150168](rust-lang#150618)

- **initial changes for mcga literals**
- **rustfmt**

r? @BoxyUwU

matthiaskrgr added a commit to matthiaskrgr/rust that referenced this pull request


          Rollup merge of rust-lang#150699 - literals-as-direct-const-args, r=B…

a74c2fb

…oxyUwU

MGCA: Support literals as direct const arguments

Fixes [rust-lang#150168](rust-lang#150618)

- **initial changes for mcga literals**
- **rustfmt**

r? @BoxyUwU

matthiaskrgr added a commit to matthiaskrgr/rust that referenced this pull request


          Rollup merge of rust-lang#150699 - literals-as-direct-const-args, r=B…

ab5075d

…oxyUwU

MGCA: Support literals as direct const arguments

Fixes [rust-lang#150168](rust-lang#150618)

- **initial changes for mcga literals**
- **rustfmt**

r? @BoxyUwU

This was referenced Jan 8, 2026

Rollup of 12 pull requests #150838

Closed

Rollup of 11 pull requests #150839

Merged

rust-bors bot added a commit that referenced this pull request


          Auto merge of #150839 - matthiaskrgr:rollup-3a0ebXJ, r=matthiaskrgr

3fda0e4

Rollup of 11 pull requests

Successful merges:

 - #149961 (tidy: add if-installed prefix condition to extra checks system)
 - #150475 (std: sys: fs: uefi: Implement initial File)
 - #150533 (std: sys: fs: uefi: Implement remove_dir_all)
 - #150549 (fix missing_panics_doc in `std::os::fd::owned`)
 - #150699 (MGCA: Support literals as direct const arguments)
 - #150721 (Deprecated doc intra link)
 - #150802 (Minor cleanups to fn_abi_new_uncached)
 - #150803 (compiler-builtins subtree update)
 - #150809 (Update `literal-escaper` version to `0.0.7`)
 - #150811 (Store defids instead of symbol names in the aliases list)
 - #150825 (Query associated_item_def_ids when needed)

r? @ghost

rust-bors bot merged commit cb3b2d8 into rust-lang:main

11 checks passed

rustbot added this to the 1.94.0 milestone

rust-timer added a commit that referenced this pull request


          Unrolled build for #150699

7dcb568

Rollup merge of #150699 - literals-as-direct-const-args, r=BoxyUwU

MGCA: Support literals as direct const arguments

Fixes [#150168](#150618)

- **initial changes for mcga literals**
- **rustfmt**

r? @BoxyUwU

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