When compiling without a specified `--edition`, emit a note by estebank · Pull Request #158102 · rust-lang/rust

estebank · 2026-06-18T20:28:57Z

No description provided.

estebank · 2026-06-18T20:39:23Z

I'll try to write an MCP later (unless someone does it for me). This change was motivated after seeing https://internals.rust-lang.org/t/code-compiles-on-playground-but-fails-when-passed-via-stdin-to-rustc/24393 where the different defaults between cargo, playground and rustc caused people to get confused.

rustbot · 2026-07-21T02:25:26Z

Some changes occurred in src/tools/compiletest

cc @jieyouxu

rustbot · 2026-07-21T02:25:29Z

r? @jieyouxu

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jieyouxu · 2026-08-04T01:02:33Z


 fn main() {
-    rustc().input("foo-prev.rs").run();
+    rustc().edition("2015").input("foo-prev.rs").run();


Remark: we could consider default setting edition but allow overriding, but explicit is fine

rust-bors · 2026-08-04T01:05:18Z

📌 Commit a1d6de2 has been approved by jieyouxu

It is now in the queue for this repository.

…ieyouxu When compiling without a specified `--edition`, emit a note

jhpratt · 2026-08-04T04:39:49Z

@bors r- #160481 (comment)

---- messages::deduplicate_errors stdout ----
running `/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/release/cargo test -j1`

thread 'messages::deduplicate_errors' (114996) panicked at src/tools/cargo/tests/testsuite/messages.rs:163:10:

--- Expected
++++ actual:   stderr
   1    1 | [COMPILING] foo v0.0.1 ([ROOT]/foo)
   2      - [NOTE] `--edition` is unspecified, defaulting to `2015` while the latest is `2024`; it must be one of: <2015|2018|2021|2024|future>
   3      - 
   4    2 | [ERROR] expected one of `!` or `::`, found `should`
   5    3 |  --> src/lib.rs:2:22
   6    4 |   |
   7    5 | 2 |                 this should not compile
   8    6 |   |                      ^^^^^^ expected one of `!` or `::`
   9    7 | 
  10    8 | [ERROR] could not compile `foo` (lib) due to 1 previous error



---- messages::deduplicate_errors stdout end ----
---- messages::deduplicate_messages_basic stdout ----
running `/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/release/cargo test --no-run -j1`

thread 'messages::deduplicate_messages_basic' (115030) panicked at src/tools/cargo/tests/testsuite/messages.rs:87:10:

--- Expected
++++ actual:   stderr
   1    1 | [COMPILING] foo v0.0.1 ([ROOT]/foo)
   2      - [NOTE] `--edition` is unspecified, defaulting to `2015` while the latest is `2024`; it must be one of: <2015|2018|2021|2024|future>
   3      - 
   4    2 | [WARNING] unused variable: `x`
   5    3 |  --> src/lib.rs:3:25
   6    4 |   |
   7    5 | 3 |                     let x = 1;
   8    6 |   |                         ^ [HELP] if this is intentional, prefix it with an underscore: `_x`
   9    7 |   |
  10    8 |   = [NOTE] `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
  11    9 | 
  12      - [WARNING] `foo` (lib) generated 1 warning[..]
       10 + [WARNING] `foo` (lib) generated 1 warning (run `cargo fix --lib -p foo` to apply 1 suggestion)
  13   11 | [WARNING] `foo` (lib test) generated 1 warning (1 duplicate)
  14   12 | [FINISHED] `test` profile [unoptimized + debuginfo] target(s) in [ELAPSED]s
  15      - [EXECUTABLE] unittests src/lib.rs (target/debug/deps/foo-[HASH][EXE])
       13 + [EXECUTABLE] unittests src/lib.rs (target/debug/deps/foo-[HASH])



---- messages::deduplicate_messages_basic stdout end ----

rust-bors · 2026-08-04T04:39:57Z

This pull request was unapproved.

This PR was contained in a rollup (#160481), which was unapproved.

View changes since this unapproval

rustbot · 2026-09-13T23:31:18Z

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.

rust-log-analyzer · 2026-09-14T00:03:25Z

The job test-aarch64-gnu-llvm-21-2 failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)

    Finished `release` profile [optimized] target(s) in 2.45s
     Running `/checkout/obj/build/aarch64-unknown-linux-gnu/stage3-codegen/aarch64-unknown-linux-gnu/release/y test --download-dir /checkout/obj/build/cg_clif_download --out-dir /checkout/obj/build/aarch64-unknown-linux-gnu/stage2-codegen/cg_clif --no-unstable-features --use-backend cranelift --sysroot llvm --skip-test testsuite.extended_sysroot`
##[group]Build sysroot
[BUILD] sysroot None
note: `--edition` is unspecified, defaulting to `2015` while the latest is `2024`; it must be one of: <2015|2018|2021|2024|future>

[RUSTC-TIMING] ____ test:false 0.020
note: `--edition` is unspecified, defaulting to `2015` while the latest is `2024`; it must be one of: <2015|2018|2021|2024|future>

note: `--edition` is unspecified, defaulting to `2015` while the latest is `2024`; it must be one of: <2015|2018|2021|2024|future>

note: `--edition` is unspecified, defaulting to `2015` while the latest is `2024`; it must be one of: <2015|2018|2021|2024|future>

##[endgroup]
##[group][BUILD] mini_core
[BUILD] mini_core
##[endgroup]
---

##[endgroup]
##[group]Build sysroot
[BUILD] sysroot Llvm
note: `--edition` is unspecified, defaulting to `2015` while the latest is `2024`; it must be one of: <2015|2018|2021|2024|future>

[RUSTC-TIMING] ____ test:false 0.021
note: `--edition` is unspecified, defaulting to `2015` while the latest is `2024`; it must be one of: <2015|2018|2021|2024|future>

note: `--edition` is unspecified, defaulting to `2015` while the latest is `2024`; it must be one of: <2015|2018|2021|2024|future>

note: `--edition` is unspecified, defaulting to `2015` while the latest is `2024`; it must be one of: <2015|2018|2021|2024|future>

##[endgroup]
##[group][AOT] arbitrary_self_types_pointers_and_wrappers
[AOT] arbitrary_self_types_pointers_and_wrappers
##[endgroup]
---
[AOT] issue-59326
##[endgroup]
##[group][AOT] neon
[AOT] neon
note: `--edition` is unspecified, defaulting to `2015` while the latest is `2024`; it must be one of: <2015|2018|2021|2024|future>

##[endgroup]
##[group][AOT] gen_block_iterate
[AOT] gen_block_iterate
##[endgroup]
---
   Compiling rustc_interface v0.0.0 (/checkout/compiler/rustc_interface)
error[E0061]: this function takes 3 arguments but 2 arguments were supplied
    --> compiler/rustc_interface/src/tests.rs:952:16
     |
 952 |     let opts = build_session_options(&mut early_dcx, &matches);
     |                ^^^^^^^^^^^^^^^^^^^^^-------------------------- argument #3 of type `bool` is missing
     |
note: function defined here
    --> compiler/rustc_session/src/config.rs:2692:8
     |
2692 | pub fn build_session_options(
     |        ^^^^^^^^^^^^^^^^^^^^^
help: provide the argument
     |
 952 |     let opts = build_session_options(&mut early_dcx, &matches, /* bool */);
     |                                                              ++++++++++++

error[E0061]: this function takes 3 arguments but 2 arguments were supplied
    --> compiler/rustc_interface/src/tests.rs:963:20
     |
 963 |         let opts = build_session_options(&mut early_dcx, &matches);
     |                    ^^^^^^^^^^^^^^^^^^^^^-------------------------- argument #3 of type `bool` is missing
     |
note: function defined here
    --> compiler/rustc_session/src/config.rs:2692:8
     |
2692 | pub fn build_session_options(
     |        ^^^^^^^^^^^^^^^^^^^^^
help: provide the argument
     |
 963 |         let opts = build_session_options(&mut early_dcx, &matches, /* bool */);
     |                                                                  ++++++++++++

error[E0061]: this function takes 3 arguments but 2 arguments were supplied
    --> compiler/rustc_interface/src/tests.rs:976:20
     |
 976 |         let opts = build_session_options(&mut early_dcx, &matches);
     |                    ^^^^^^^^^^^^^^^^^^^^^-------------------------- argument #3 of type `bool` is missing
     |
note: function defined here
    --> compiler/rustc_session/src/config.rs:2692:8
     |
2692 | pub fn build_session_options(
     |        ^^^^^^^^^^^^^^^^^^^^^
help: provide the argument
     |
 976 |         let opts = build_session_options(&mut early_dcx, &matches, /* bool */);
     |                                                                  ++++++++++++

[RUSTC-TIMING] rustc_driver_impl test:true 2.320
   Compiling rustc_public v0.1.0-preview (/checkout/compiler/rustc_public)
For more information about this error, try `rustc --explain E0061`.

As part of notifying users calling bare `rustc` without an explicit edition that they should likely be using the 2024 edition, update cargo tests to not trigger the new user facing note. This change will let rust-lang/rust#158102 to land.

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estebank force-pushed the note-default-edition branch from b923a75 to 2a486d3 Compare June 18, 2026 20:41

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estebank force-pushed the note-default-edition branch from 4241536 to d71c2fa Compare July 21, 2026 02:17

estebank mentioned this pull request Jul 21, 2026

Emit note when calling rustc without specifying an edition rust-lang/compiler-team#1019

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estebank added the S-blocked Status: Blocked on something else such as an RFC or other implementation work. label Jul 21, 2026

estebank marked this pull request as ready for review July 21, 2026 02:25

rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Jul 21, 2026

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jieyouxu removed the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Jul 25, 2026

estebank force-pushed the note-default-edition branch from d71c2fa to a1d6de2 Compare July 27, 2026 06:56

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estebank added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-blocked Status: Blocked on something else such as an RFC or other implementation work. labels Aug 3, 2026

jieyouxu approved these changes Aug 4, 2026

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rust-bors Bot added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Aug 4, 2026

jhpratt added a commit to jhpratt/rust that referenced this pull request Aug 4, 2026

Rollup merge of rust-lang#158102 - estebank:note-default-edition, r=j…

e252a66

…ieyouxu When compiling without a specified `--edition`, emit a note

jhpratt mentioned this pull request Aug 4, 2026

Rollup of 29 pull requests #160481

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rust-bors Bot added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Aug 4, 2026

estebank added 5 commits September 13, 2026 23:19

When compiling without a specified --edition, emit a note

c17c8fe

Use same wording as cargo does when package.edition is unspecified

16943ca

Remove --edition=2015 from rustdoc-gui tests only

a97e0d0

fix run-make test

bbec60e

Re-add the hability to emit notes exclusively for missing --edition

a25876f

estebank force-pushed the note-default-edition branch from a1d6de2 to a25876f Compare September 13, 2026 23:31

estebank mentioned this pull request Sep 13, 2026

Specify --edition in messages tests rust-lang/cargo#17470

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cubic-dev-ai Bot mentioned this pull request Sep 14, 2026

[pull] master from rust-lang:master coleleavitt/cargo#83

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