error[E0599]: no method named `local_file` found for struct `proc_macro2::Span` in the current scope

[tofuwu-dev]

I'm having a new trouble when I build anchor initial project today:

error[E0599]: no method named local_file found for struct proc_macro2::Span in the current scope
--> /home/haodev007/.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 | | .local_file()
| | -^^^^^^^^^^ method not found in Span
| ||
|

I've checked the issue #3662 yesterday and downgraded proc-macro2 crate version
cargo update -p proc-macro2 --precise 1.0.94
It worked with anchor version 0.31.0 yesterday after downgraded proc-macro2 version but it doesnt work again

current rust and anchor version is
rustc 1.86.0 (05f9846f8 2025-03-31)
anchor-cli 0.31.1

Please help me, thanks!

[jacobcreech]

@h0lme3 what's your Solana cli version as well?

Most people have fixed this issue by upgrading to latest rustc stable with anchor 0.31.1

[SNEGUR-D]

I’m experiencing the same issue, it worked yesterday but not today.

UPD: Updating anchor worked for me

[tofuwu-dev]

@h0lme3 what's your Solana cli version as well?

Most people have fixed this issue by upgrading to latest rustc stable with anchor 0.31.1

solana cli version
solana-cli 2.1.19 (src:c696ac8f; feat:1416569292, client:Agave)

[jacobcreech]

@h0lme3 could you run cargo update? Seems people are running into this because their crates.io cache is out of date.

[getong]

@h0lme3 could you run cargo update? Seems people are running into this because their crates.io cache is out of date.

cargo update not work
anchor build --no-idl works

[tofuwu-dev]

@h0lme3 could you run cargo update? Seems people are running into this because their crates.io cache is out of date.

@jacobcreech sorry, it's just not working and anchor build --no-idl works to build project temporarily without idl.
But we should still do like that?

[DeepakMehra53]

Current Version
rust version : rustc 1.86.0 (05f9846f8 2025-03-31)
anchor version : anchor-cli 0.31.1
cargo version : cargo 1.86.0 (adf9b6ad1 2025-02-28)
proc-macro : "1.0.94"

while build the anchor didn't work
anchor build ❌

Issue
cannot find type SourceFilein crateproc_macro Compiler(proc_macro::SourceFile),
🧩Likely caused by a dependency (possibly proc-macro2) attempting to access compiler-only APIs.
Now should i downgrade the proc-macro2 crate

[jsonDoge]

Was only able to get it back working with IDL using these (Linux):
anchor: 0.31.0
rustc: 1.79.0
solana-cli: 2.1.0

proc-macro2: 1.0.95

And applying the fix described here: https://solana.stackexchange.com/questions/21553/proc-macro2-issue

In anchor-syn-0.31.0 file defined.rs:499 line replace with -> let source_path = proc_macro2::Span::call_site().file();

Otherwise only worked with --no-idl

[dehypnosis]

Any folks found comprehensive solution while locking in 0.31.0 ? 😳

[alloc33]

cargo update fixed the stuff

[mikemaccana]

Have been getting the following since upgrading to 0.31.1 (yes point one).

Solana CLI: solana-cli 2.1.0 (src:c1080de4; feat:3176011155, client:Agave)
Anchor: anchor-cli 0.31.1
Node: v22.11.0
Rust: rustc 1.82.0 (f6e511eec 2024-10-15)

I have run cargo update as request.

When I run anchor build I get:

error[E0599]: no method named `file` found for reference `&proc_macro::Span` in the current scope
   --> /Users/mike/.cargo/registry/src/index.crates.io-6f17d22bba15001f/proc-macro2-1.0.95/src/wrapper.rs:465:36
    |
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
   --> /Users/mike/.cargo/registry/src/index.crates.io-6f17d22bba15001f/proc-macro2-1.0.95/src/wrapper.rs:473:36
    |
473 |             Span::Compiler(s) => s.local_file(),
    |                                    ^^^^^^^^^^ method not found in `&Span`

For more information about this error, try `rustc --explain E0599`.
error: could not compile `proc-macro2` (lib) due to 2 previous errors
warning: build failed, waiting for other jobs to finish...
Error: Building IDL failed. Run `ANCHOR_LOG=true anchor idl build` to see the logs.

[adisehrawat]

Okay, try this
reinstall rust and anchor then check for the anchor version, it should be 0.31.1 then recreate the project and check for the anchor-lang version in cargo.toml and anchor_version in Anchor.toml, it should be 0.31.1 and then try anchor build. It works for me after new update of anchor.
rustc version should be 1.86.0

[rotcan]

@mikemaccana Did you find any solution? I am getting same error.

rust - nightly-2025-04-21
anchor - 0.31.1
solana - 2.1.4
proc-macro2 - 0.1.94

[jacobcreech]

@rotcan Your issue is with proc-macro2 1.0.94. It needs to be at least 1.0.95