Extended paths on windows break rust-analyzer.

rust-analyzer version: rust-analyzer version: 0.3.2345-standalone (b0632f749e 2025-03-16) [c:\Users<removed username>.vscode\extensions\rust-lang.rust-analyzer-0.3.2345-win32-x64\server\rust-analyzer.exe]

rustc version: rustc 1.85.0 (4d91de4e4 2025-02-17)

editor or extension: VSCode

relevant settings: None altered, defaults.

code snippet to reproduce: Not caused by code, happens when vs code opens with a path containing \\?\ before the drive letter.

Error message
[Error - 2:33:07 AM] Restarting server failed
Message: Pending response rejected since connection got disposed
Code: -32097
Error: Failed to deserialize InitializeParams: invalid international domain name: "file://%3F/g%3A/hackclub-ideas-backend"; {"processId":49436,"clientInfo":{"name":"Visual Studio Code","version":"1.98.2"},"locale":"en","rootPath":"\\?\G:\hackclub-ideas-backend","rootUri":"file://%3F/g%3A/hackclub-ideas-backend","capabilities":{"workspace":{"applyEdit":true,"workspaceEdit":{"documentChanges":true,"resourceOperations":["create","rename","delete"],"failureHandling":"textOnlyTransactional","normalizesLineEndings":true,"changeAnnotationSupport":{"groupsOnLabel":true}},"configuration":true,"didChangeWatchedFiles":{"dynamicRegistration":true,"relativePatternSupport":true},"symbol":{"dynamicRegistration":true,"symbolKind":{"valueSet":[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26]},"tagSupport":{"valueSet":[1]},"resolveSupport":{"properties":["location.range"]}},"codeLens":{"refreshSupport":true},"executeCommand":{"dynamicRegistration":true},"didChangeConfiguration":{"dynamicRegistration":true},"workspaceFolders":true,"foldingRange":{"refreshSupport":true},"semanticTokens":{"refreshSupport":true},"fileOperations":{"dynamicRegistration":true,"didCreate":true,"didRename":true,"didDelete":true,"willCreate":true,"willRename":true,"willDelete":true},"inlineValue":{"refreshSupport":true},"inlayHint":{"refreshSupport":true},"diagnostics":{"refreshSupport":true}},"textDocument":{"publishDiagnostics":{"relatedInformation":true,"versionSupport":false,"tagSupport":{"valueSet":[1,2]},"codeDescriptionSupport":true,"dataSupport":true},"synchronization":{"dynamicRegistration":true,"willSave":true,"willSaveWaitUntil":true,"didSave":true},"completion":{"dynamicRegistration":true,"contextSupport":true,"completionItem":{"snippetSupport":true,"commitCharactersSupport":true,"documentationFormat":["markdown","plaintext"],"deprecatedSupport":true,"preselectSupport":true,"tagSupport":{"valueSet":[1]},"insertReplaceSupport":true,"resolveSupport":{"properties":["documentation","detail","additionalTextEdits"]},"insertTextModeSupport":{"valueSet":[1,2]},"labelDetailsSupport":true},"insertTextMode":2,"completionItemKind":{"valueSet":[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25]},"completionList":{"itemDefaults":["commitCharacters","editRange","insertTextFormat","insertTextMode","data"]}},"hover":{"dynamicRegistration":true,"contentFormat":["markdown","plaintext"]},"signatureHelp":{"dynamicRegistration":true,"signatureInformation":{"documentationFormat":["markdown","plaintext"],"parameterInformation":{"labelOffsetSupport":true},"activeParameterSupport":true},"contextSupport":true},"definition":{"dynamicRegistration":true,"linkSupport":true},"references":{"dynamicRegistration":true},"documentHighlight":{"dynamicRegistration":true},"documentSymbol":{"dynamicRegistration":true,"symbolKind":{"valueSet":[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26]},"hierarchicalDocumentSymbolSupport":true,"tagSupport":{"valueSet":[1]},"labelSupport":true},"codeAction":{"dynamicRegistration":true,"isPreferredSupport":true,"disabledSupport":true,"dataSupport":true,"resolveSupport":{"properties":["edit"]},"codeActionLiteralSupport":{"codeActionKind":{"valueSet":["","quickfix","refactor","refactor.extract","refactor.inline","refactor.rewrite","source","source.organizeImports"]}},"honorsChangeAnnotations":true},"codeLens":{"dynamicRegistration":true},"formatting":{"dynamicRegistration":true},"rangeFormatting":{"dynamicRegistration":true,"rangesSupport":true},"onTypeFormatting":{"dynamicRegistration":true},"rename":{"dynamicRegistration":true,"prepareSupport":true,"prepareSupportDefaultBehavior":1,"honorsChangeAnnotations":true},"documentLink":{"dynamicRegistration":true,"tooltipSupport":true},"typeDefinition":{"dynamicRegistration":true,"linkSupport":true},"implementation":{"dynamicRegistration":true,"linkSupport":true},"colorProvider":{"dynamicRegistration":true},"foldingRange":{"dynamicRegistration":true,"rangeLimit":5000,"lineFoldingOnly":true,"foldingRangeKind":{"valueSet":["comment","imports","region"]},"foldingRange":{"collapsedText":false}},"declaration":{"dynamicRegistration":true,"linkSupport":true},"selectionRange":{"dynamicRegistration":true},"callHierarchy":{"dynamicRegistration":true},"semanticTokens":{"dynamicRegistration":true,"tokenTypes":["namespace","type","class","enum","interface","struct","typeParameter","parameter","variable","property","enumMember","event","function","method","macro","keyword","modifier","comment","string","number","regexp","operator","decorator"],"tokenModifiers":["declaration","definition","readonly","static","deprecated","abstract","async","modification","documentation","defaultLibrary"],"formats":["relative"],"requests":{"range":true,"full":{"delta":true}},"multilineTokenSupport":false,"overlappingTokenSupport":false,"serverCancelSupport":true,"augmentsSyntaxTokens":false},"linkedEditingRange":{"dynamicRegistration":true},"typeHierarchy":{"dynamicRegistration":true},"inlineValue":{"dynamicRegistration":true},"inlayHint":{"dynamicRegistration":true,"resolveSupport":{"properties":["tooltip","textEdits","label.tooltip","label.location",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Stack backtrace:
0: std::backtrace_rs::backtrace::dbghelp64::trace
at /rustc/4d91de4e48198da2e33413efdcd9cd2cc0c46688/library\std\src....\backtrace\src\backtrace\dbghelp64.rs:91
1: std::backtrace_rs::backtrace::trace_unsynchronized
at /rustc/4d91de4e48198da2e33413efdcd9cd2cc0c46688/library\std\src....\backtrace\src\backtrace\mod.rs:66
2: std::backtrace::Backtrace::create
at /rustc/4d91de4e48198da2e33413efdcd9cd2cc0c46688/library\std\src\backtrace.rs:331
3: std::backtrace::Backtrace::capture
at /rustc/4d91de4e48198da2e33413efdcd9cd2cc0c46688/library\std\src\backtrace.rs:296
4: anyhow::error::::msg
5: anyhow::__private::format_err
6: rust_analyzer::from_json
7: rust_analyzer::run_server
8: std::sys::backtrace::__rust_begin_short_backtrace
9: <&T as core::fmt::Debug>::fmt
10: alloc::boxed::impl$28::call_once
at /rustc/4d91de4e48198da2e33413efdcd9cd2cc0c46688/library\alloc\src\boxed.rs:1993
11: alloc::boxed::impl$28::call_once
at /rustc/4d91de4e48198da2e33413efdcd9cd2cc0c46688/library\alloc\src\boxed.rs:1993
12: std::sys::pal::windows:🧵:impl$0:🆕:thread_start
at /rustc/4d91de4e48198da2e33413efdcd9cd2cc0c46688/library\std\src\sys\pal\windows\thread.rs:56
13: BaseThreadInitThunk
14: RtlUserThreadStart
[Error - 2:33:09 AM] Server process exited with code 1.
[Error - 2:33:09 AM] Server initialization failed.
Message: Pending response rejected since connection got disposed
Code: -32097
[Error - 2:33:09 AM] The Rust Analyzer Language Server server crashed 5 times in the last 3 minutes. The server will not be restarted. See the output for more information.
[Error - 2:33:09 AM] Rust Analyzer Language Server client: couldn't create connection to server.
Message: Pending response rejected since connection got disposed
Code: -32097
[Error - 2:33:09 AM] Restarting server failed
Message: Pending response rejected since connection got disposed
Code: -32097

Start with rust-analyzer's LSP initialization handling and the Windows extended-path case shown in the error output. Reproduce by opening a VSCode workspace whose path uses the \?\ prefix, then verify that initialization succeeds without the invalid international domain name error.