Failed to map Rust stdlib sources when debugging in Windows

[inflation]

rust-analyzer version: (eg. output of "rust-analyzer: Show RA Version" command, accessible in VSCode via Ctrl/⌘+Shift+P)

rust-analyzer version: 0.3.2228-standalone (fa4a40bbe8 2024-12-22)

rustc version: (eg. output of rustc -V)

rustc 1.83.0 (90b35a623 2024-11-26)

editor or extension: (eg. VSCode, Vim, Emacs, etc. For VSCode users, specify your extension version; for users of other editors, provide the distribution if applicable)

vscode 0.3.2228

relevant settings: (eg. client settings, or environment variables like CARGO, RUSTC, RUSTUP_HOME or CARGO_HOME)

repository link (if public, optional): (eg. rust-analyzer)

code snippet to reproduce:

// add your code here

When debugging anything on Windows using cppvspkg, the sourceMap output in Debug console failed to map to rust src:

  "sourceFileMap": {
    "D:\\packages\\rustup\\toolchains\\stable-x86_64-pc-windows-msvc\\lib\\rustlib\\src\\rust": "D:\\packages\\rustup\\toolchains\\stable-x86_64-pc-windows-msvc\\lib\\rustlib\\src\\rust"
  },

It should be

      "sourceFileMap": {
        "\\rustc\\90b35a6239c3d8bdabc530a6a0816f7ff89a0aaf\\": "D:\\packages\\rustup\\toolchains\\stable-x86_64-pc-windows-msvc\\lib\\rustlib\\src\\rust\\"
      }

Manually setting it in launch.json works fine.

[Veykril]

relevant code is here

rust-analyzer/editors/code/src/debug.ts

Lines 163 to 180 in dc6cea5

	if (sourceFileMap === "auto") {
	sourceFileMap = {};
	const computedSourceFileMap = await discoverSourceFileMap(env, wsFolder);
	if (computedSourceFileMap) {
	// lldb-dap requires passing the source map as an array of two element arrays.
	// the two element array contains a source and destination pathname.
	// TODO: remove lldb-dap-specific post-processing once
	// https://github.com/llvm/llvm-project/pull/106919/ is released in the extension.
	if (provider.type === "lldb-dap") {
	provider.additional["sourceMap"] = [
	[computedSourceFileMap?.source, computedSourceFileMap?.destination],
	];
	} else {
	sourceFileMap[computedSourceFileMap.source] = computedSourceFileMap.destination;
	}
	}
	}