`forge bind` crashes when contract size exceeds limit

[feewet]

Component

Forge

Have you ensured that all of these are up to date?

• Foundry
• Foundryup

What version of Foundry are you on?

forge Version: 1.3.4-v1.3.4

What version of Foundryup are you on?

foundryup: 1.3.0

What command(s) is the bug in?

forge bind

Operating System

Linux

Describe the bug

Generating bindings causes a crash when building contracts with solc 0.8.30 and 0.8.28.

> forge bind
[⠊] Compiling...
[⠒] Compiling 17 files with Solc 0.8.28
[⠆] Compiling 87 files with Solc 0.8.30
[⠒] Solc 0.8.28 finished in 159.69ms
[⠢] Solc 0.8.30 finished in 1.87s
Compiler run successful!
Generating bindings for 61 contracts
The application panicked (crashed).
Message:  procedural macro API is used outside of a procedural macro
Location: library/proc_macro/src/bridge/client.rs:223

This is a bug. Consider reporting it at https://github.com/foundry-rs/foundry

  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ BACKTRACE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
                                ⋮ 8 frames hidden ⋮                               
   9: core::option::expect_failed::h89af471ff13548f9
      at <unknown source file>:<unknown line>
  10: proc_macro_error2::entry_point::h14ed050800453d29
      at <unknown source file>:<unknown line>
  11: forge_sol_macro_gen::sol_macro_gen::MultiSolMacroGen::generate_bindings::hc702871666d93fff
      at <unknown source file>:<unknown line>
  12: forge_sol_macro_gen::sol_macro_gen::MultiSolMacroGen::write_to_crate::h8493800a1254a3ca
      at <unknown source file>:<unknown line>
  13: forge::cmd::bind::BindArgs::run::hb67dd16319702d90
      at <unknown source file>:<unknown line>
  14: forge::args::run_command::h1ed47f7e68c4da1f
      at <unknown source file>:<unknown line>
  15: forge::args::run::h1cb9a4093d77957a
      at <unknown source file>:<unknown line>
  16: forge::main::h252b3ab2a9ee741f
      at <unknown source file>:<unknown line>
  17: std::sys::backtrace::__rust_begin_short_backtrace::hcc7739581483dad1
      at <unknown source file>:<unknown line>
  18: _main<unknown>
      at <unknown source file>:<unknown line>

foundry.toml

[profile.default]
src = "src"
out = "out"
libs = ["lib"]
deny-warnings = true
gas_reports = ["*"]

> forge --version && foundryup --version
forge Version: 1.3.4-v1.3.4
Commit SHA: fd677c899b643cf3f3abd2c7905a6e0ca2598c0c
Build Timestamp: 2025-09-03T11:39:53.680729000Z (1756899593)
Build Profile: maxperf
foundryup: 1.3.0

[feewet]

It looks like it could be an issue in alloy. It seems like this function is failing:

https://github.com/alloy-rs/core/blob/781f4bb3a8b3dd800a8801bb736c35cba3790a03/crates/sol-macro-expander/src/expand/mod.rs#L44

[grandizzy]

@feewet can you pls share more details / a way ti0repro, I am not able to repro with a simple counter contract duped and built with different version

[⠊] Compiling...
[⠒] Compiling 23 files with Solc 0.8.13
[⠢] Compiling 1 files with Solc 0.8.30
[⠘] Solc 0.8.30 finished in 8.76ms
[⠃] Solc 0.8.13 finished in 502.21ms
Compiler run successful!
Generating bindings for 2 contracts
Bindings have been generated to /home/george/work/foundry-issues/issue-11538/out/bindings

thank you!

[feewet]

I recreated the bug here: https://github.com/feewet/foundry-bind-bug

It seems to occur when the contract size exceeds the size limit.

[yash-atreya]

Able to reproduce

[yash-atreya]

Crash is occuring here: https://github.com/rust-lang/rust/blob/master/library/proc_macro/src/bridge/client.rs#L221-L226