No diagnostics after the client responds to `workspace/configuration`

[bstaletic]

Because some other server required it, ycmd is doing the following:

1. Send initialize request and wait for response.
2. Send initialized notification.
3. Send workspace/didChangeConfiguration notification.

This triggers workspace/configuration request, to which, provided no user configuration, ycmd will respond with [null]. This, however, results in rust-analyzer sending empty diagnostics until the next didSave notification.

Here's the full log of exchanged messages:

2020-07-20 21:46:58,432 - DEBUG - TX: Sending message: b'Content-Length: 1052\r\n\r\n{"id":1,"jsonrpc":"2.0","method":"initialize","params":{"capabilities":{"experimental":{"statusNotification":true},"textDocument":{"codeAction":{"codeActionLiteralSupport":{"codeActionKind":{"valueSet":["","quickfix","refactor","refactor.extract","refactor.inline","refactor.rewrite","source","source.organizeImports"]}}},"completion":{"completionItem":{"documentationFormat":["plaintext","markdown"]},"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]}},"hover":{"contentFormat":["plaintext","markdown"]},"signatureHelp":{"signatureInformation":{"documentationFormat":["plaintext","markdown"],"parameterInformation":{"labelOffsetSupport":false}}},"synchronization":{"didSave":true}},"workspace":{"configuration":true}},"initializationOptions":{},"processId":12969,"rootPath":"/home/bstaletic/.vim/pack/bundle/start/YouCompleteMe/third_party/ycmd/ycmd/tests/rust/testdata/common","rootUri":"file:///home/bstaletic/.vim/pack/bundle/start/YouCompleteMe/third_party/ycmd/ycmd/tests/rust/testdata/common"}}'
2020-07-20 21:46:58,433 - DEBUG - RX: Received message: b'{"jsonrpc":"2.0","id":1,"result":{"capabilities":{"callHierarchyProvider":true,"codeActionProvider":{"codeActionKinds":["","quickfix","refactor","refactor.extract","refactor.inline","refactor.rewrite"]},"codeLensProvider":{"resolveProvider":true},"completionProvider":{"triggerCharacters":[":","."]},"definitionProvider":true,"documentFormattingProvider":true,"documentHighlightProvider":true,"documentOnTypeFormattingProvider":{"firstTriggerCharacter":"=","moreTriggerCharacter":[".",">"]},"documentSymbolProvider":true,"experimental":{"joinLines":true,"onEnter":true,"parentModule":true,"runnables":{"kinds":["cargo"]},"ssr":true},"foldingRangeProvider":true,"hoverProvider":true,"implementationProvider":true,"referencesProvider":true,"renameProvider":{"prepareProvider":true},"selectionRangeProvider":true,"semanticTokensProvider":{"documentProvider":true,"legend":{"tokenModifiers":["documentation","declaration","definition","static","abstract","deprecated","readonly","constant","controlFlow","injected","mutable","unsafe","attribute"],"tokenTypes":["comment","keyword","string","number","regexp","operator","namespace","type","struct","class","interface","enum","typeParameter","function","member","property","macro","variable","parameter","label","attribute","boolean","builtinType","enumMember","escapeSequence","formatSpecifier","generic","lifetime","selfKeyword","typeAlias","union","unresolvedReference"]},"rangeProvider":true},"signatureHelpProvider":{"triggerCharacters":["(",","]},"textDocumentSync":{"change":2,"openClose":true,"save":{}},"typeDefinitionProvider":true,"workspaceSymbolProvider":true},"serverInfo":{"name":"rust-analyzer","version":"f5a4a4b"}}}'
2020-07-20 21:46:58,435 - DEBUG - TX: Sending notification: b'Content-Length: 52\r\n\r\n{"jsonrpc":"2.0","method":"initialized","params":{}}'
2020-07-20 21:46:58,435 - DEBUG - TX: Sending notification: b'Content-Length: 86\r\n\r\n{"jsonrpc":"2.0","method":"workspace/didChangeConfiguration","params":{"settings":{}}}'
2020-07-20 21:46:58,436 - DEBUG - TX: Sending notification: b'Content-Length: 555\r\n\r\n{"jsonrpc":"2.0","method":"textDocument/didOpen","params":{"textDocument":{"languageId":"rust","text":"mod test;\\n\\nuse test::*;\\n\\nstruct Earth {}\\nstruct Mars {}\\ntrait Atmosphere {}\\nimpl Atmosphere for Earth {}\\nimpl Atmosphere for Mars {}\\n\\nfn main() {\\n    create_universe();\\n    let builder = Builder {};\\n    builder.build_\\n}\\n\\nfn             format_test() {\\n\\n    let\\n        a : \\ni32 = 5;\\n}\\n","uri":"file:///home/bstaletic/.vim/pack/bundle/start/YouCompleteMe/third_party/ycmd/ycmd/tests/rust/testdata/common/src/main.rs","version":1}}}'
2020-07-20 21:46:58,437 - DEBUG - RX: Received message: b'{"jsonrpc":"2.0","id":0,"method":"client/registerCapability","params":{"registrations":[{"id":"textDocument/didSave","method":"textDocument/didSave","registerOptions":{"documentSelector":[{"pattern":"**/*.rs"},{"pattern":"**/Cargo.toml"},{"pattern":"**/Cargo.lock"}]}}]}}'
2020-07-20 21:46:58,437 - DEBUG - TX: Sending response: b'Content-Length: 38\r\n\r\n{"id":0,"jsonrpc":"2.0","result":null}'
2020-07-20 21:46:58,437 - DEBUG - RX: Received message: b'{"jsonrpc":"2.0","id":1,"method":"workspace/configuration","params":{"items":[{"section":"rust-analyzer"}]}}'
2020-07-20 21:46:58,437 - DEBUG - TX: Sending response: b'Content-Length: 40\r\n\r\n{"id":1,"jsonrpc":"2.0","result":[null]}'
2020-07-20 21:46:58,440 - DEBUG - RX: Received message: b'{"jsonrpc":"2.0","method":"rust-analyzer/status","params":"invalid"}'
2020-07-20 21:46:58,441 - DEBUG - RX: Received message: b'{"jsonrpc":"2.0","method":"textDocument/publishDiagnostics","params":{"diagnostics":[],"uri":"file:///home/bstaletic/.vim/pack/bundle/start/YouCompleteMe/third_party/ycmd/ycmd/tests/rust/testdata/common/src/main.rs"}}'
2020-07-20 21:46:58,514 - DEBUG - RX: Received message: b'{"jsonrpc":"2.0","method":"rust-analyzer/status","params":"loading"}'
2020-07-20 21:46:58,602 - DEBUG - RX: Received message: b'{"jsonrpc":"2.0","method":"rust-analyzer/status","params":"ready"}'
2020-07-20 21:47:02,111 - DEBUG - RX: Received message: b'{"jsonrpc":"2.0","method":"textDocument/publishDiagnostics","params":{"diagnostics":[],"uri":"file:///home/bstaletic/.vim/pack/bundle/start/YouCompleteMe/third_party/ycmd/ycmd/tests/rust/testdata/common/src/main.rs"}}'
2020-07-20 21:47:07,142 - DEBUG - TX: Sending notification: b'Content-Length: 218\r\n\r\n{"jsonrpc":"2.0","method":"textDocument/didSave","params":{"textDocument":{"uri":"file:///home/bstaletic/.vim/pack/bundle/start/YouCompleteMe/third_party/ycmd/ycmd/tests/rust/testdata/common/src/main.rs","version":1}}}'
2020-07-20 21:47:07,673 - DEBUG - RX: Received message: b'{"jsonrpc":"2.0","method":"textDocument/publishDiagnostics","params":{"diagnostics":[{"code":"E0609","message":"no field `build_` on type `test::Builder`\\nunknown field","range":{"end":{"character":18,"line":13},"start":{"character":12,"line":13}},"severity":1,"source":"rustc"}],"uri":"file:///home/bstaletic/.vim/pack/bundle/start/YouCompleteMe/third_party/ycmd/ycmd/tests/rust/testdata/common/src/main.rs"}}'

On request, I can provide rust-analyzer's log too, just tell me at what verbosity level.

Another thing to note in the above log is that the first rust-analyzer/status is invalid, then loading and then ready. What's up with the invalid one?

Finally, contrast the above log with the following one, where ycmd returns an error response on worksapce/configuration.

2020-07-20 21:53:31,189 - DEBUG - TX: Sending message: b'Content-Length: 1232\r\n\r\n{"id":1,"jsonrpc":"2.0","method":"initialize","params":{"capabilities":{"experimental":{"statusNotification":true},"textDocument":{"codeAction":{"codeActionLiteralSupport":{"codeActionKind":{"valueSet":["","quickfix","refactor","refactor.extract","refactor.inline","refactor.rewrite","source","source.organizeImports"]}}},"completion":{"completionItem":{"documentationFormat":["plaintext","markdown"]},"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]}},"hover":{"contentFormat":["plaintext","markdown"]},"signatureHelp":{"signatureInformation":{"documentationFormat":["plaintext","markdown"],"parameterInformation":{"labelOffsetSupport":false}}},"synchronization":{"didSave":true}},"workspace":{"applyEdit":true,"didChangeWatchedFiles":{"dynamicRegistration":true},"documentChanges":true,"symbol":{"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]}}}},"initializationOptions":{},"processId":14895,"rootPath":"/home/bstaletic/.vim/pack/bundle/start/YouCompleteMe/third_party/ycmd/ycmd/tests/rust/testdata/common","rootUri":"file:///home/bstaletic/.vim/pack/bundle/start/YouCompleteMe/third_party/ycmd/ycmd/tests/rust/testdata/common"}}'
2020-07-20 21:53:31,190 - DEBUG - RX: Received message: b'{"jsonrpc":"2.0","id":1,"result":{"capabilities":{"callHierarchyProvider":true,"codeActionProvider":{"codeActionKinds":["","quickfix","refactor","refactor.extract","refactor.inline","refactor.rewrite"]},"codeLensProvider":{"resolveProvider":true},"completionProvider":{"triggerCharacters":[":","."]},"definitionProvider":true,"documentFormattingProvider":true,"documentHighlightProvider":true,"documentOnTypeFormattingProvider":{"firstTriggerCharacter":"=","moreTriggerCharacter":[".",">"]},"documentSymbolProvider":true,"experimental":{"joinLines":true,"onEnter":true,"parentModule":true,"runnables":{"kinds":["cargo"]},"ssr":true},"foldingRangeProvider":true,"hoverProvider":true,"implementationProvider":true,"referencesProvider":true,"renameProvider":{"prepareProvider":true},"selectionRangeProvider":true,"semanticTokensProvider":{"documentProvider":true,"legend":{"tokenModifiers":["documentation","declaration","definition","static","abstract","deprecated","readonly","constant","controlFlow","injected","mutable","unsafe","attribute"],"tokenTypes":["comment","keyword","string","number","regexp","operator","namespace","type","struct","class","interface","enum","typeParameter","function","member","property","macro","variable","parameter","label","attribute","boolean","builtinType","enumMember","escapeSequence","formatSpecifier","generic","lifetime","selfKeyword","typeAlias","union","unresolvedReference"]},"rangeProvider":true},"signatureHelpProvider":{"triggerCharacters":["(",","]},"textDocumentSync":{"change":2,"openClose":true,"save":{}},"typeDefinitionProvider":true,"workspaceSymbolProvider":true},"serverInfo":{"name":"rust-analyzer","version":"f5a4a4b"}}}'
2020-07-20 21:53:31,191 - DEBUG - TX: Sending notification: b'Content-Length: 52\r\n\r\n{"jsonrpc":"2.0","method":"initialized","params":{}}'
2020-07-20 21:53:31,191 - DEBUG - TX: Sending notification: b'Content-Length: 86\r\n\r\n{"jsonrpc":"2.0","method":"workspace/didChangeConfiguration","params":{"settings":{}}}'
2020-07-20 21:53:31,192 - DEBUG - Refreshing file /home/bstaletic/.vim/pack/bundle/start/YouCompleteMe/third_party/ycmd/ycmd/tests/rust/testdata/common/src/main.rs: State is Open/action Open
2020-07-20 21:53:31,192 - DEBUG - TX: Sending notification: b'Content-Length: 555\r\n\r\n{"jsonrpc":"2.0","method":"textDocument/didOpen","params":{"textDocument":{"languageId":"rust","text":"mod test;\\n\\nuse test::*;\\n\\nstruct Earth {}\\nstruct Mars {}\\ntrait Atmosphere {}\\nimpl Atmosphere for Earth {}\\nimpl Atmosphere for Mars {}\\n\\nfn main() {\\n    create_universe();\\n    let builder = Builder {};\\n    builder.build_\\n}\\n\\nfn             format_test() {\\n\\n    let\\n        a : \\ni32 = 5;\\n}\\n","uri":"file:///home/bstaletic/.vim/pack/bundle/start/YouCompleteMe/third_party/ycmd/ycmd/tests/rust/testdata/common/src/main.rs","version":1}}}'
2020-07-20 21:53:31,193 - DEBUG - RX: Received message: b'{"jsonrpc":"2.0","id":0,"method":"client/registerCapability","params":{"registrations":[{"id":"textDocument/didSave","method":"textDocument/didSave","registerOptions":{"documentSelector":[{"pattern":"**/*.rs"},{"pattern":"**/Cargo.toml"},{"pattern":"**/Cargo.lock"}]}}]}}'
2020-07-20 21:53:31,193 - DEBUG - TX: Sending response: b'Content-Length: 38\r\n\r\n{"id":0,"jsonrpc":"2.0","result":null}'
2020-07-20 21:53:31,193 - DEBUG - RX: Received message: b'{"jsonrpc":"2.0","id":1,"method":"workspace/configuration","params":{"items":[{"section":"rust-analyzer"}]}}'
2020-07-20 21:53:31,193 - DEBUG - TX: Sending response: b'Content-Length: 77\r\n\r\n{"error":{"code":-32601,"message":"Method not found"},"id":1,"jsonrpc":"2.0"}'
2020-07-20 21:53:31,271 - DEBUG - RX: Received message: b'{"jsonrpc":"2.0","method":"rust-analyzer/status","params":"loading"}'
2020-07-20 21:53:31,357 - DEBUG - RX: Received message: b'{"jsonrpc":"2.0","method":"rust-analyzer/status","params":"ready"}'
2020-07-20 21:53:31,430 - DEBUG - RX: Received message: b'{"jsonrpc":"2.0","method":"textDocument/publishDiagnostics","params":{"diagnostics":[{"code":"E0609","message":"no field `build_` on type `test::Builder`\\nunknown field","range":{"end":{"character":18,"line":13},"start":{"character":12,"line":13}},"severity":1,"source":"rustc"}],"uri":"file:///home/bstaletic/.vim/pack/bundle/start/YouCompleteMe/third_party/ycmd/ycmd/tests/rust/testdata/common/src/main.rs"}}'
2020-07-20 21:53:34,870 - DEBUG - RX: Received message: b'{"jsonrpc":"2.0","method":"textDocument/publishDiagnostics","params":{"diagnostics":[{"code":"E0609","message":"no field `build_` on type `test::Builder`\\nunknown field","range":{"end":{"character":18,"line":13},"start":{"character":12,"line":13}},"severity":1,"source":"rustc"}],"uri":"file:///home/bstaletic/.vim/pack/bundle/start/YouCompleteMe/third_party/ycmd/ycmd/tests/rust/testdata/common/src/main.rs"}}'

Differences between the two:

1. There's no invalid status at any point.
2. Diagnostics arrive as expected.

Finally, I'm testing with this file/project: https://github.com/ycm-core/ycmd/blob/master/ycmd/tests/rust/testdata/common/src/main.rs

[kjeremy]

Why does the second example throw an error? Is that just for your testing?

[bstaletic]

Because we currently do not support workspace/configuration and do not declare the related capability. Therefore the polite thing to do is return an error response with the code MethodNotImplemented, as opposed to just not responding to that request.

EDIT: In the first log, I can also return [{}] and RA's behaviour will be the same.

[kjeremy]

I think what's happening is that the [null] returned from workspace/configuration is turning off the diagnostics and the flycheck gets triggered on the next save.

https://github.com/rust-analyzer/rust-analyzer/blob/76c1fac9c3ed9fa3f784e5cdde7dd770c9fac6c1/crates/rust-analyzer/src/main_loop.rs#L451-L484

https://github.com/rust-analyzer/rust-analyzer/blob/76c1fac9c3ed9fa3f784e5cdde7dd770c9fac6c1/crates/rust-analyzer/src/reload.rs#L19-L30

Can you turn on debug logging so we can see what "config update response:" is?

[kjeremy]

By the same token InitializationOptions having an empty value may also be problematic. You may not want to send that down at all.

[bstaletic]

I think what's happening is that the [null] returned from workspace/configuration is turning off the diagnostics and the flycheck gets triggered on the next save.

I don't know if it makes any difference, but I can also respond with [{}] and have the same result.

Can you turn on debug logging so we can see what "config update response:" is?

The above logs contain the LSP messages, just from the client's (ycmd's) perspective. The RA's log, with RA_LOG='rust_analyzer=debug' is here: https://gist.github.com/bstaletic/70f4ecb45616166b1dfbad44d1972226

[bstaletic]

By the same token InitializationOptions having an empty value may also be problematic. You may not want to send that down at all.

You mean I shouldn't be sending {} in initializationOptions? But it's very much possible I have nothing else to send.

[kjeremy]

I'm saying if initializationOptions doesn't have the rust-analyzer section leave it out of InitializeParams entirely (since initializationOptions is optional). It looks like it will overwrite the default config:

https://github.com/rust-analyzer/rust-analyzer/blob/2c67ca0146c215df908de0066b124d63d2ba8fe7/crates/rust-analyzer/src/bin/main.rs#L124-L126

I'll try to verify this in a bit.

[kjeremy]

Also you are right in that you should be able to send [null] in workspace/configuration. I'll see if I can fix that.

[bstaletic]

I'm saying if initializationOptions doesn't have the rust-analyzer section leave it out of InitializeParams entirely (since initializationOptions is optional).

Okay, now I understand. However, I'd call this problematic. Right now everything regarding initializationOptions is completely generic.

https://github.com/ycm-core/ycmd/blob/master/ycmd/completers/language_server/language_server_protocol.py#L269

https://github.com/ycm-core/ycmd/blob/master/ycmd/completers/language_server/language_server_completer.py#L1946

Implementing "if rust and rust-analyzer not in settings" is VERY server specific.

Also you are right in that you should be able to send [null] in workspace/configuration. I'll see if I can fix that.

I know @matklad said that it should work.

[kjeremy]

Can you see if https://github.com/kjeremy/rust-analyzer/tree/null-configuration helps?

[kjeremy]

I can reproduce this if I send a null for initializeOptions. I THINK it should be safe to filter that out.

[bstaletic]

Can you see if https://github.com/kjeremy/rust-analyzer/tree/null-configuration helps?

With that branch I didn't get any diagnostics at all, even after didSave.

One more question regarding initializationOptions. Should the value be { 'rust-analyzer': <settings> } or just <settings>? From what you're telling me and what @matklad told me before, it should be { 'rust-analyzer': <settings> }. However, this seems to imply that it should just be <settings>.

I'm saying if initializationOptions doesn't have the rust-analyzer section leave it out of InitializeParams entirely (since initializationOptions is optional).

Now that I think about it, ycmd could omit initializationOptions if the user did not provide any. So it shouldn't be that much of a problem. And if user supplies options that are invalid, that's on user.

[kjeremy]

I just force pushed a new version that should tackle both workspace/configuration and initializationOptions being null

[kjeremy]

One more question regarding initializationOptions. Should the value be { 'rust-analyzer': <settings> } or just <settings>? From what you're telling me and what @matklad told me before, it should be { 'rust-analyzer': <settings> }. However, this seems to imply that it should just be <settings>

initializationOptions should be <settings>. The branch I posted should allow you to send down a null value for <settings> and get the defaults.

[bstaletic]

At commit adc4bb54062bd0bdff8bfaecce238990f4225bac, still not getting any diagnostics.

Here are the LSP messages:

2020-07-20 23:49:33,494 - DEBUG - TX: Sending message: b'Content-Length: 1052\r\n\r\n{"id":1,"jsonrpc":"2.0","method":"initialize","params":{"capabilities":{"experimental":{"statusNotification":true},"textDocument":{"codeAction":{"codeActionLiteralSupport":{"codeActionKind":{"valueSet":["","quickfix","refactor","refactor.extract","refactor.inline","refactor.rewrite","source","source.organizeImports"]}}},"completion":{"completionItem":{"documentationFormat":["plaintext","markdown"]},"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]}},"hover":{"contentFormat":["plaintext","markdown"]},"signatureHelp":{"signatureInformation":{"documentationFormat":["plaintext","markdown"],"parameterInformation":{"labelOffsetSupport":false}}},"synchronization":{"didSave":true}},"workspace":{"configuration":true}},"initializationOptions":{},"processId":25600,"rootPath":"/home/bstaletic/.vim/pack/bundle/start/YouCompleteMe/third_party/ycmd/ycmd/tests/rust/testdata/common","rootUri":"file:///home/bstaletic/.vim/pack/bundle/start/YouCompleteMe/third_party/ycmd/ycmd/tests/rust/testdata/common"}}'
2020-07-20 23:49:33,499 - DEBUG - RX: Received message: b'{"jsonrpc":"2.0","id":1,"result":{"capabilities":{"callHierarchyProvider":true,"codeActionProvider":{"codeActionKinds":["","quickfix","refactor","refactor.extract","refactor.inline","refactor.rewrite"]},"codeLensProvider":{"resolveProvider":true},"completionProvider":{"triggerCharacters":[":","."]},"definitionProvider":true,"documentFormattingProvider":true,"documentHighlightProvider":true,"documentOnTypeFormattingProvider":{"firstTriggerCharacter":"=","moreTriggerCharacter":[".",">"]},"documentSymbolProvider":true,"experimental":{"joinLines":true,"onEnter":true,"parentModule":true,"runnables":{"kinds":["cargo"]},"ssr":true},"foldingRangeProvider":true,"hoverProvider":true,"implementationProvider":true,"referencesProvider":true,"renameProvider":{"prepareProvider":true},"selectionRangeProvider":true,"semanticTokensProvider":{"documentProvider":true,"legend":{"tokenModifiers":["documentation","declaration","definition","static","abstract","deprecated","readonly","constant","controlFlow","injected","mutable","unsafe","attribute"],"tokenTypes":["comment","keyword","string","number","regexp","operator","namespace","type","struct","class","interface","enum","typeParameter","function","member","property","macro","variable","parameter","label","attribute","boolean","builtinType","enumMember","escapeSequence","formatSpecifier","generic","lifetime","punctuation","selfKeyword","typeAlias","union","unresolvedReference"]},"rangeProvider":true},"signatureHelpProvider":{"triggerCharacters":["(",","]},"textDocumentSync":{"change":2,"openClose":true,"save":{}},"typeDefinitionProvider":true,"workspaceSymbolProvider":true},"serverInfo":{"name":"rust-analyzer","version":"adc4bb5"}}}'
2020-07-20 23:49:33,501 - DEBUG - TX: Sending notification: b'Content-Length: 52\r\n\r\n{"jsonrpc":"2.0","method":"initialized","params":{}}'
2020-07-20 23:49:33,501 - DEBUG - TX: Sending notification: b'Content-Length: 86\r\n\r\n{"jsonrpc":"2.0","method":"workspace/didChangeConfiguration","params":{"settings":{}}}'
2020-07-20 23:49:33,502 - DEBUG - TX: Sending notification: b'Content-Length: 555\r\n\r\n{"jsonrpc":"2.0","method":"textDocument/didOpen","params":{"textDocument":{"languageId":"rust","text":"mod test;\\n\\nuse test::*;\\n\\nstruct Earth {}\\nstruct Mars {}\\ntrait Atmosphere {}\\nimpl Atmosphere for Earth {}\\nimpl Atmosphere for Mars {}\\n\\nfn main() {\\n    create_universe();\\n    let builder = Builder {};\\n    builder.build_\\n}\\n\\nfn             format_test() {\\n\\n    let\\n        a : \\ni32 = 5;\\n}\\n","uri":"file:///home/bstaletic/.vim/pack/bundle/start/YouCompleteMe/third_party/ycmd/ycmd/tests/rust/testdata/common/src/main.rs","version":1}}}'
2020-07-20 23:49:33,517 - DEBUG - RX: Received message: b'{"jsonrpc":"2.0","id":0,"method":"client/registerCapability","params":{"registrations":[{"id":"textDocument/didSave","method":"textDocument/didSave","registerOptions":{"documentSelector":[{"pattern":"**/*.rs"},{"pattern":"**/Cargo.toml"},{"pattern":"**/Cargo.lock"}],"includeText":false}}]}}'
2020-07-20 23:49:33,517 - DEBUG - TX: Sending response: b'Content-Length: 38\r\n\r\n{"id":0,"jsonrpc":"2.0","result":null}'
2020-07-20 23:49:33,518 - DEBUG - RX: Received message: b'{"jsonrpc":"2.0","id":1,"method":"workspace/configuration","params":{"items":[{"section":"rust-analyzer"}]}}'
2020-07-20 23:49:33,518 - DEBUG - TX: Sending response: b'Content-Length: 40\r\n\r\n{"id":1,"jsonrpc":"2.0","result":[null]}'
2020-07-20 23:49:33,581 - DEBUG - RX: Received message: b'{"jsonrpc":"2.0","id":2,"method":"client/registerCapability","params":{"registrations":[{"id":"workspace/didChangeWatchedFiles","method":"workspace/didChangeWatchedFiles","registerOptions":{"watchers":[{"globPattern":"/home/bstaletic/.vim/pack/bundle/start/YouCompleteMe/third_party/ycmd/ycmd/tests/rust/testdata/common/**/*.rs"}]}}]}}'
2020-07-20 23:49:33,588 - DEBUG - TX: Sending response: b'Content-Length: 38\r\n\r\n{"id":2,"jsonrpc":"2.0","result":null}'
2020-07-20 23:49:33,643 - DEBUG - RX: Received message: b'{"jsonrpc":"2.0","method":"rust-analyzer/status","params":"loading"}'
2020-07-20 23:49:33,667 - DEBUG - RX: Received message: b'{"jsonrpc":"2.0","method":"rust-analyzer/status","params":"ready"}'
2020-07-20 23:49:53,109 - DEBUG - TX: Sending notification: b'Content-Length: 218\r\n\r\n{"jsonrpc":"2.0","method":"textDocument/didSave","params":{"textDocument":{"uri":"file:///home/bstaletic/.vim/pack/bundle/start/YouCompleteMe/third_party/ycmd/ycmd/tests/rust/testdata/common/src/main.rs","version":1}}}'
2020-07-20 23:49:53,605 - DEBUG - TX: Sending notification: b'Content-Length: 223\r\n\r\n{"jsonrpc":"2.0","method":"workspace/didChangeWatchedFiles","params":{"changes":[{"type":3,"uri":"file:///home/bstaletic/.vim/pack/bundle/start/YouCompleteMe/third_party/ycmd/ycmd/tests/rust/testdata/common/src/main.rs"}]}}'
2020-07-20 23:49:53,606 - DEBUG - TX: Sending notification: b'Content-Length: 223\r\n\r\n{"jsonrpc":"2.0","method":"workspace/didChangeWatchedFiles","params":{"changes":[{"type":1,"uri":"file:///home/bstaletic/.vim/pack/bundle/start/YouCompleteMe/third_party/ycmd/ycmd/tests/rust/testdata/common/src/main.rs"}]}}'
2020-07-20 23:49:53,606 - DEBUG - TX: Sending notification: b'Content-Length: 223\r\n\r\n{"jsonrpc":"2.0","method":"workspace/didChangeWatchedFiles","params":{"changes":[{"type":2,"uri":"file:///home/bstaletic/.vim/pack/bundle/start/YouCompleteMe/third_party/ycmd/ycmd/tests/rust/testdata/common/src/main.rs"}]}}'

And the RA log: https://gist.github.com/bstaletic/70f4ecb45616166b1dfbad44d1972226