rust: Don't pass toolchain around using env variables

Holzhaus · Holzhaus · commit 7c22138df193 · 2022-10-03T22:05:12.000+02:00
diff --git a/pre_commit/languages/rust.py b/pre_commit/languages/rust.py
@@ -174,7 +174,7 @@ def install_environment(
                 packages_to_install.add((package,))
 
         with in_env(prefix, version):
-            toolchain = os.getenv('RUSTUP_TOOLCHAIN')
+            toolchain = TOOLCHAIN_FROM_VERSION.get(version, version)
             if toolchain is not None:
                 install_rust_with_toolchain(toolchain)
 
