From 48b1aa2a21ab687549025f0e5aff9a4e12c5aeac Mon Sep 17 00:00:00 2001
From: Xin <xin@imfing.com>
Date: Sat, 3 Oct 2026 12:30:06 +0100
Subject: [PATCH] fix: pin Rust toolchain via rust-toolchain.toml, fix
 deprecated f64 path

CI's dtolnay/rust-toolchain@stable floats to the newest stable, so its
clippy -D warnings gate drifts ahead of local toolchains - rustc 1.99
newly deprecates the std::f64 module constants, failing lint-rust on a
'use std::f64' in config.rs tests (local 1.97 was silent). Remove the
import so f64::INFINITY resolves to the associated constant.

Pin 1.99.0 in rust-toolchain.toml: rustup applies it automatically to
local builds, CI, and the V8 archive builder containers, making lint
results reproducible everywhere. Bump deliberately; same policy as the
ruff pin (#14).
---
 docs/contributing/development.md | 2 +-
 rust-toolchain.toml              | 7 +++++++
 src/runtime/config.rs            | 1 -
 3 files changed, 8 insertions(+), 2 deletions(-)
 create mode 100644 rust-toolchain.toml

diff --git a/docs/contributing/development.md b/docs/contributing/development.md
index 5d1fbb5..3066974 100644
--- a/docs/contributing/development.md
+++ b/docs/contributing/development.md
@@ -6,7 +6,7 @@
     Building on Linux and Windows requires compiling `rusty_v8` from source, which can take 30+ minutes and requires additional dependencies (Python, Clang/LLVM, etc.). See the [rusty_v8 build documentation](https://github.com/denoland/rusty_v8?tab=readme-ov-file#build-v8-from-source) for platform-specific requirements.
 
 - **Python**: 3.10 or higher
-- **Rust**: Latest stable toolchain (install via [rustup](https://rust-lang.org/tools/install/))
+- **Rust**: Install via [rustup](https://rust-lang.org/tools/install/); the version is pinned in `rust-toolchain.toml` and rustup selects it automatically, keeping local builds, lints, and CI on the same toolchain
 - **uv**: Fast Python package manager (install via [uv docs](https://docs.astral.sh/uv/getting-started/installation/))
 - **Make**: Build automation tool (usually pre-installed on macOS/Linux)
 
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 0000000..44f7243
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,7 @@
+# Single source of truth for the Rust toolchain: rustup picks this up
+# automatically for local builds, CI, and the V8 archive builder containers,
+# so lint results (clippy -D warnings) stay reproducible everywhere.
+# Bump deliberately; `make all` must pass under the new version.
+[toolchain]
+channel = "1.99.0"
+components = ["clippy", "rustfmt"]
diff --git a/src/runtime/config.rs b/src/runtime/config.rs
index c2b4240..ed7b3d3 100644
--- a/src/runtime/config.rs
+++ b/src/runtime/config.rs
@@ -498,7 +498,6 @@ impl RuntimeConfig {
 mod tests {
     use super::*;
     use pyo3::types::PyFloat;
-    use std::f64;
 
     #[test]
     fn test_default_config() {