Lang server sometimes sending duplicated error messages through lsp

[KawaiiSelbst]

Hows it looking in helix. Default language config for Nim

What i see in helix log

2025-07-25T17:57:35.650 helix_lsp::transport [ERROR] nimlangserver err <- "DBG Sending result(s)                          length=6 command=\"chkFile \\\"C:\\\\Users\\\\Public\\\\Coding\\\\nim\\\\dups\\\\example.nim\\\";\\\"C:\\\\Users\\\\askar\\\\AppData\\\\Local\\\\Temp\\\\nimlangserver\\\\53A0177FA811B3FB.nim\\\":0:0\"\n"

[moigagoo]

I noticed that this specific issue appears kinda randomly: sometimes I do get the duplicate error messages but mostly it doesn't happen.

However, if you type gg gggg, you will get a duplicate error message consistently:

{
  "jsonrpc": "2.0",
  "method": "textDocument/publishDiagnostics",
  "params": {
    "uri": "file:///C%3A/Users/moigagoo/Projects/langserver/foo.nim",
    "diagnostics": [
      {
        "range": {
          "start": {
            "line": 0,
            "character": 0
          },
          "end": {
            "line": 0,
            "character": 2
          }
        },
        "severity": 1,
        "code": "nimsuggest chk",
        "source": "nim",
        "message": "undeclared identifier: 'gg'",
        "relatedInformation": null
      },
      {
        "range": {
          "start": {
            "line": 0,
            "character": 3
          },
          "end": {
            "line": 0,
            "character": 88
          }
        },
        "severity": 1,
        "code": "nimsuggest chk",
        "source": "nim",
        "message": "undeclared identifier: 'gggg'\ncandidates (edit distance, scope distance); see '--spellSuggest': \n (2, 1): 'gg'",
        "relatedInformation": null
      },
      {
        "range": {
          "start": {
            "line": 0,
            "character": 3
          },
          "end": {
            "line": 0,
            "character": 7
          }
        },
        "severity": 1,
        "code": "nimsuggest chk",
        "source": "nim",
        "message": "expression 'gggg' has no type (or is ambiguous)",
        "relatedInformation": null
      },
      {
        "range": {
          "start": {
            "line": 0,
            "character": 0
          },
          "end": {
            "line": 0,
            "character": 15
          }
        },
        "severity": 1,
        "code": "nimsuggest chk",
        "source": "nim",
        "message": "attempting to call routine: 'gg'\n  found 'gg' [unknown declared in C:\\Users\\moigagoo\\Projects\\langserver\\foo.nim(1, 1)]",
        "relatedInformation": null
      },
      {
        "range": {
          "start": {
            "line": 0,
            "character": 0
          },
          "end": {
            "line": 0,
            "character": 15
          }
        },
        "severity": 1,
        "code": "nimsuggest chk",
        "source": "nim",
        "message": "attempting to call routine: 'gg'\n  found 'gg' [unknown declared in C:\\Users\\moigagoo\\Projects\\langserver\\foo.nim(1, 1)]",
        "relatedInformation": null
      },
      {
        "range": {
          "start": {
            "line": 0,
            "character": 0
          },
          "end": {
            "line": 0,
            "character": 2
          }
        },
        "severity": 1,
        "code": "nimsuggest chk",
        "source": "nim",
        "message": "attempting to call undeclared routine: 'gg'",
        "relatedInformation": null
      }
    ]
  }
}

This part appears twice: "message": "attempting to call routine: 'gg'\n found 'gg' [unknown declared in C:\\Users\\moigagoo\\Projects\\langserver\\foo.nim(1, 1)]",.

This happens consistently in VSCode and Helix (I didn't check other editors though).

I wonder if this is the same issue or a different one.

[moigagoo]

Keeping track of the progress.

I've added logging[1] to file to processQueue in suggestapi.nim and I'm seeing duplicate messages coming from nimsuggest:

chk	skUnknown		Error	C:\Users\moigagoo\Projects\foo.nim	1	0	"undeclared identifier: \'notexisting\'\x0Acandidates (edit distance, scope distance); see \'--spellSuggest\': \x0A (5, 2): \'newString\'"	0
chk	skUnknown		Error	C:\Users\moigagoo\Projects\foo.nim	1	0	"undeclared identifier: \'notexisting\'\x0Acandidates (edit distance, scope distance); see \'--spellSuggest\': \x0A (5, 2): \'newString\'"	0

1: Added this to lines 463:

        var logFile = open(expandTilde("~/langserver.log"), fmAppend)
        writeFile(expandTilde("~/langserver.log"), content)
        close(logFile)