Build from source on Windows - Cargo error without Rust toolchain

Follows on from https://github.com/nodejs/node/issues/63213 ### Version v27.0.0-pre 0e8fb913d857b0d4123995e401293a0c9ee5efd8 ### Platform ```text Microsoft Windows NT 10.0.26200.0 x64 ``` ### Subsystem build ### What steps will reproduce the bug? On Windows 11 25H2, follow prerequisite [Manual install](https://github.com/nodejs/node/blob/main/BUILDING.md#option-1-manual-install) instructions using: - Python 3.14.5 - Visual Basic 2026 Build Tools 18.6.0 (May 2026) - C++ Clang Compiler for Windows (Microsoft.VisualStudio.Component.VC.Llvm.Clang) - MSBuild support for LLVM (clang-cl) toolset (Microsoft.VisualStudio.Component.VC.Llvm.ClangToolset) - NASM 3.01 - Do not install a Rust toolchain (and otherwise ensure that there is no `rustc` or `cargo` installed). In PowerShell 7 terminal, execute: ```shell git clone https://github.com/nodejs/node cd node git switch main git clean -xfd # if repeating .\vcbuild.bat Release\node -e "console.log('Hello from Node.js', process.version)" ``` ### How often does it reproduce? Is there a required condition? Always if there is no Rust toolchain installed. Test with the following, which should both return errors: ```shell rustc --version cargo --version ``` ### What is the expected behavior? Why is that the expected behavior? If a Rust toolchain is not installed, `vcbuild.bat` should warn (check for `rustc` & `cargo`) that Temporal support is disabled and continue to build without error. This is implied by the documentation section [Building Node.js with Temporal support](https://github.com/nodejs/node/blob/main/BUILDING.md#building-nodejs-with-temporal-support) and the fact that on Linux, builds succeed if there is no Rust toolchain installed. > If `--v8-enable-temporal-support` and `--v8-disable-temporal-support` are both omitted, `configure.py` probes for `cargo` and `rustc`. If either is missing, a warning is printed and Temporal support is disabled. It should also be possible to disable temporal support actively when buildin…