fix: Update `proc-macro2` usage for latest nightly by cryptopapi997 · Pull Request #3663 · otter-sec/anchor

cryptopapi997 · 2025-04-16T10:45:40Z

As of nightly-2025-04-16, SourceFile and the methods around it don't exist anymore, so anyone updating rust or installing rust won't be able to compile the idl anymore. proc-macro2 already updated, this PR updates anchor accordingly. Note that this will require users to update to the latest nightly (and will break users with an older nightly). Idk if this counts as a breaking change since it only affects nightly...

Fixes #3662

tobaccorico · 2025-04-16T17:19:00Z

as far as I can tell it also affects stable, not only nightly (at least on my local build)

kingmanas · 2025-04-16T18:16:21Z

Replace the respective error line with

📁 File:

defined.rs

📝 Line 499:

let source_path = proc_macro2::Span::call_site().file();

Rayato159 · 2025-04-16T19:53:41Z

I'm facing this problem too even though I use stable version of rustc.

RealAyyo · 2025-04-16T20:30:19Z

same. Not only nightly

acheroncrypto

Thanks for the quick fix.

We're also planning to make the IDL generation use the stable compiler by default and make code that required nightly optional via a CLI flag to avoid issues like this one. It sounds like these methods will be stabilized (as mentioned in rust-lang/rust#139671), so we might be able to avoid nightly completely when that happens.

Related: There is an open issue (rust-lang/rust#139903) regarding the naming of local_file.

hryer · 2025-04-16T22:48:14Z

Is anything that I can help maybe?, I need this fix ASAP. Also, I want to tell the CI failed

no method named `source_file` found for struct `proc_macro2::Span` in the current scope
   --> /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/anchor-syn-0.31.0/src/idl/defined.rs:499:66
    |
499 |                 let source_path = proc_macro2::Span::call_site().source_file().path();
    |                                                                  ^^^^^^^^^^^ method not found in `Span`

jacobcreech · 2025-04-17T01:37:34Z

@hryer we're waiting on the update and I'll check into the CI

andreisilviudragnea · 2025-04-17T07:07:52Z

Hello. Is this going to be released as a hotfix for Anchor v0.31.0?

quanghuynguyen1902 · 2025-04-17T07:21:48Z

Please fix it ASAP.

moribus-single · 2025-04-17T08:09:39Z

having the same issue
even in the new empty anchor project

tobaccorico · 2025-04-17T08:12:15Z

having the same issue even in the new empty anchor project

this is the temporary fix that worked best for me:
https://solana.stackexchange.com/a/21560/39751

conceitodigital · 2025-04-17T10:18:06Z

Facing the same issue.

romeoscript · 2025-04-17T10:40:15Z

source_path

i can't find this file , where would i locate it ?

iamramtin · 2025-04-17T16:54:24Z

Using anchor build --no-idl works as a temporary workaround (tested on Anchor v0.30.1)

romeoscript · 2025-04-17T19:37:10Z

Using anchor build --no-idl works as a temporary workaround (tested on Anchor v0.30.1)

so how do i generate IDL for frontend use ?

acheroncrypto

We're most likely going to make a patch release for this issue. Thanks for the fix and also responsiveness!

adama789 · 2025-04-18T13:12:07Z

Hi, how to pull these changes? Will it be released in anchor 0.31.1?

Vinayapr23 · 2025-04-18T20:59:18Z

How will these changes be reflected? In anchor 0.31.1 ?
So what to do with current 0.31.0 in the meantime

stevensanborn · 2025-04-19T07:29:31Z

anchor-cli 0.31.0
rustc 1.88.0-nightly (191df20fc 2025-04-18)
adding to cargo toml worked for me :
proc-macro2 = { version = "1.0.95"}

tofuwu-dev · 2025-04-19T14:51:49Z

Is it fixed?

0xJamesBong · 2025-04-20T21:13:25Z

So what's the solution?

Vinayapr23 · 2025-04-20T21:15:13Z

So what's the solution?

Update to anchor 0.31.1 which was released today

tofuwu-dev · 2025-04-20T21:16:55Z

So what's the solution?

Update to anchor 0.31.1 which was released today

please check the issue, I figured out the issue yesterday but today I am facing a new issue
#3676 (comment)

0xm4ud · 2025-04-21T14:12:13Z

@hryer this line: let source_path = proc_macro2::Span::call_site().source_file().path();
into this: let source_path = proc_macro2::Span::call_site().file().to_string();

cryptopapi997 · 2025-04-21T14:56:42Z

For anyone still runing into this issue:

Make sure you're using

anchor v0.31.1
latest rust nightly
proc_macro2 v0.1.95 in your cargo.lock

rotcan · 2025-04-21T19:55:38Z

Getting below error while using

anchor v0.31.1
rust nightly-2025-04-21
proc_macro2 v0.1.95

Error

no method named file found for reference &proc_macro::Span in the current scope
|
465 | Span::Compiler(s) => s.file(),
| ^^^^ method not found in &Span

error[E0599]: no method named local_file found for reference &proc_macro::Span in the current scope
|
473 | Span::Compiler(s) => s.local_file(),
| ^^^^^^^^^^ method not found in &Span

0xm4ud · 2025-04-21T19:58:30Z

@rotcan

Getting below error while using

anchor v0.31.1

rust nightly-2025-04-21

proc_macro2 v0.1.95

Error

no method named file found for reference &proc_macro::Span in the current scope | 465 | Span::Compiler(s) => s.file(), | ^^^^ method not found in &Span

error[E0599]: no method named local_file found for reference &proc_macro::Span in the current scope | 473 | Span::Compiler(s) => s.local_file(), | ^^^^^^^^^^ method not found in &Span

have you tried reverting proc_macro2 v0.1.95 to proc_macro2 v0.1.94?

rotcan · 2025-04-21T20:06:55Z

Hi @0xm4ud ,

@rotcan

Getting below error while using

anchor v0.31.1

rust nightly-2025-04-21

proc_macro2 v0.1.95

Error
no method named file found for reference &proc_macro::Span in the current scope | 465 | Span::Compiler(s) => s.file(), | ^^^^ method not found in &Span
error[E0599]: no method named local_file found for reference &proc_macro::Span in the current scope | 473 | Span::Compiler(s) => s.local_file(), | ^^^^^^^^^^ method not found in &Span

have you tried reverting proc_macro2 v0.1.95 to proc_macro2 v0.1.94?

With below configuration

anchor v0.31.1
rust nightly - 2025-04-21
proc_macro2 v0.1.94
solana - 2.1.4

I am getting this error

no method named file found for struct proc_macro2::Span in the current scope
--> /.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/anchor-syn-0.31.1/src/idl/defined.rs:501:22
|
500 | let source_path = proc_macro2::Span::call_site()
| ______________-
501 | | .file()
| | -^^^^ method not found in Span
| ||
|

0xm4ud · 2025-04-21T20:13:12Z

@rotcan I saw that error this morning. What I did was: cargo update -p proc-macro2, rustup override set 1.81, which solved it for me.
btw I'm not running nightly.

rotcan · 2025-04-21T20:37:52Z

@0xm4ud , still getting same error with below setting :(

anchor 0.31.1
rust- 1.81
proc_macro2 v0.1.94
solana - 2.1.4

no method named file found for struct proc_macro2::Span in the current scope
--> /.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/anchor-syn-0.31.1/src/idl/defined.rs:501:22
|
500 | let source_path = proc_macro2::Span::call_site()
| ______________-
501 | | .file()
| | -^^^^ method not found in Span
| ||

0xm4ud · 2025-04-21T20:48:17Z

@rotcan hmm.. cargo update -p proc-macro2 should've changed/updated your proc-macro2 version, but by your post I see still is 1.94, try removing the lib /proc-macro2-1.0.94/directory and running cargo update -p proc-macro2 again.
Clean the project as well, and cargo clean before building it again.
Updating proc-macro2 v1.0.94 -> v1.0.95

rotcan · 2025-04-21T22:05:59Z

@0xm4ud Got it working thanks. I deleted proc-macro2-1.0.94 & 95 directory and anchor-syn-0.31.1 directory in cargo registry. Then ran rustup update.
Following config worked
rustup - 2025-04-21 nightly
anchor - 0.31.1
solana - 2.14.0
proc-macro2 - 1.0.95

jgur-psyops · 2025-04-22T20:01:32Z

Was confused by people saying you need nightly rust.

You don't need to be using nightly in your workspace, but you DO need to update your nightly because anchor idl generation uses it. Make sure you have run rustup update and your rustc 1.88.0-nightly in the resulting list is up to date. Your toolchain can be 1.81.0 or 1.79 stable without issue.

el-tumero · 2025-05-28T14:32:20Z

this works for me:

anchor - 0.31.1
solana - 2.1.0
proc-macro2 - 1.0.95
rust - 1.81.0

Dustin4444

#3952

Splits the mint flow into two on-chain instructions to support the Bonsol callback signing model (where the prover PDA — not the user authority — signs the mint): 1. init_lote(): permissionless reservation of LoteAccount, called by the client BEFORE submitting the proof request to Bonsol. Binds the lote to the expected execution_account PDA derived from the execute_v1 args. 2. mint_from_proof(): refactored to be a true Bonsol callback handler. Validates execution_request via vendored handle_callback (key, owner=Bonsol, signer, image_id), then populates the pre-reserved lote and mints the 3 assets. Account changes: - LoteAccount: +execution_account (Pubkey), +is_minted (bool) - MintFromProof accounts: removed init/payer/authority/system_program, added execution_request (UncheckedAccount). 13 -> 9 boxed fields. - New InitLote accounts struct (cpa, lote, payer, system_program). Other: - Add IMAGE_ID_HEX const + #[cfg(test)] cross-validation with IMAGE_ID - Add MRV_OUTPUT_SIZE / CALLBACK_PAYLOAD_SIZE constants for host-runner to construct the callback_instruction_prefix correctly - New errors: AlreadyMinted, PeriodoMismatch - Drop orphan helper output_bytes_extract_periodo - bonsol_callback.rs: silence dead_code warning on input_digest field (reserved for future audit-trail use) Validation: - cargo build-sbf: clean (~325KB, 9 boxed accounts in MintFromProof) - cargo test --lib: 3 host-side tests pass KNOWN ISSUE: anchor test fails to build IDL due to anchor-syn 0.30.1 hard-dependency on proc_macro::SourceFile (removed from rustc) combined with proc-macro2 1.0.94 unable to compile on modern toolchains. This is the upstream bug fixed in anchor 0.31.1 (PR otter-sec/anchor#3663), not backported to 0.30.1. Confirmed unfixable by Rust version pinning: no Rust version satisfies both edition2024 (cargo deps) and proc_macro:: SourceFile availability simultaneously. TS tests are deferred to end-to-end devnet integration (Stage 6 of the hackathon roadmap), where init_lote and the callback path are exercised against a real Bonsol prover. Plan: stay on Anchor 0.30.1 through the hackathon submission, evaluate upgrade to 0.31.x post-MVP.

bump proc-macro2

4926929

cryptopapi997 changed the title ~~Update proc-macro for latest nightly~~ Update proc-macro2 usage for latest nightly Apr 16, 2025

cryptopapi997 changed the title ~~Update proc-macro2 usage for latest nightly~~ Update proc-macro2 usage for latest nightly Apr 16, 2025

cryptopapi997 changed the title ~~Update proc-macro2 usage for latest nightly~~ fix: Update proc-macro2 usage for latest nightly Apr 16, 2025

This was referenced Apr 16, 2025

anchor-syn 0.31.0 is incompatible with proc-macro2 >= 1.0.95 #3661

Closed

error[E0599]: no method named source_file found for struct proc_macro2::Span in the current scope #3662

Closed

changelog

7fb5b40

niooss-ledger reviewed Apr 16, 2025

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Comment thread lang/syn/src/idl/defined.rs Outdated

cryptopapi997 added 2 commits April 16, 2025 13:26

file() -> local_file()

a7e2b45

fmt

f2adbf1

acheroncrypto added idl related to the IDL, either program or client side fix Bug fix PR labels Apr 16, 2025

acheroncrypto reviewed Apr 16, 2025

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Comment thread lang/syn/src/idl/defined.rs Outdated

fmt, remove extra indents

1c44e6d

cryptopapi997 requested a review from acheroncrypto April 17, 2025 08:15

Reinis-FRP mentioned this pull request Apr 17, 2025

fix(svm): pin rust toolchain for solana across-protocol/contracts#960

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acheroncrypto approved these changes Apr 17, 2025

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acheroncrypto merged commit 54d5396 into otter-sec:master Apr 17, 2025
48 of 52 checks passed

cryptopapi997 deleted the fix-proc-macro-2 branch April 17, 2025 21:32

jgur-psyops mentioned this pull request Apr 18, 2025

Anchor 0.31.0 update 0dotxyz/marginfi-v2#326

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2 tasks

smoelius mentioned this pull request Apr 22, 2025

Figure out how to handle Anchor 0.31 trailofbits/anchor-coverage#6

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Reinis-FRP mentioned this pull request Apr 23, 2025

fix: upgrade anchor to 0.31.1 across-protocol/contracts#972

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IaroslavMazur mentioned this pull request Apr 30, 2025

chore: update Anchor version sablier-labs/solsab#87

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arijoon mentioned this pull request May 3, 2025

feat: multi system arijoon/solana-nix#4

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TheLazySol mentioned this pull request Jun 19, 2025

Anchor Build Fails: proc-macro2 v1.0.95 Compilation Error with Missing Span Methods solana-foundation/templates#60

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Dustin4444 reviewed Nov 17, 2025

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Otter-0x4ka5h pushed a commit to Otter-0x4ka5h/anchor that referenced this pull request Mar 25, 2026

idl: Update proc-macro2 usage for latest nightly (otter-sec#3663)

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📁 File:

📝 Line 499:

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