Clojurians Log v2

perhaps this is more a clj-kondo issue?

if you can repro it on the command line without lsp, that would be interesting

clj-kondo correclty lints it, which is why this surprised me

https://github.com/NoahTheDuke/lsp-repro

from the readme:

noah ~/personal/lsp-example
jj:[@ vktvxuym 55e1665d]
$ rm -rf .clj-kondo/.cache .lsp/.cache
noah ~/personal/lsp-example
jj:[@ vktvxuym 55e1665d]
$ clojure-lsp diagnostics
[ 99%] Project analyzed            Finding diagnostics...
src/lsp/core.clj:9:10: error: [invalid-arity] lsp.other/one-arg is called with 2 args but expects 1
src/lsp/core.clj:5:4: info: [clojure-lsp/unused-public-var] Unused public var 'lsp.core/f'
src/lsp/core.clj:7:12: info: [clojure-lsp/unused-public-var] Unused public var 'lsp.core/R'
noah ~/personal/lsp-example
jj:[@ vktvxuym 55e1665d]
$ nvim src/lsp/core.clj
noah ~/personal/lsp-example
jj:[@ vktvxuym 55e1665d]
$ clojure-lsp diagnostics
[ 99%] Project analyzed            Finding diagnostics...
src/lsp/core.clj:5:4: info: [clojure-lsp/unused-public-var] Unused public var 'lsp.core/f'
src/lsp/core.clj:7:12: info: [clojure-lsp/unused-public-var] Unused public var 'lsp.core/R'

and if i tail the clojure-lsp log, i see that textDocument/publishDiagnostics doesn't send over the invalid-arity anymore:

2026-09-25T16:48:52.441Z  DEBUG [clojure-lsp.server:61] - [Trace - 2026-09-25T16:48:52.441Z] Sending notification 'textDocument/publishDiagnostics'
Params: {
  "uri" : "file:///Users/noah.bogart/personal/lsp-example/src/lsp/core.clj",
  "diagnostics" : [ {
    "range" : {
      "start" : {
        "line" : 4,
        "character" : 3
      },
      "end" : {
        "line" : 4,
        "character" : 4
      }
    },
    "severity" : 3,
    "message" : "Unused public var 'lsp.core/f'",
    "code" : "clojure-lsp/unused-public-var",
    "source" : "clojure-lsp",
    "tags" : [ 1 ]
  }, {
    "range" : {
      "start" : {
        "line" : 6,
        "character" : 11
      },
      "end" : {
        "line" : 6,
        "character" : 12
      }
    },
    "severity" : 3,
    "message" : "Unused public var 'lsp.core/R'",
    "code" : "clojure-lsp/unused-public-var",
    "source" : "clojure-lsp",
    "tags" : [ 1 ]
  } ]
}

so something strange is happening here, but i'm not sure what

and then if i add the same invalid call outside of the protocl method body, the error now appears for both sites:

2026-09-25T16:53:59.960Z  DEBUG [clojure-lsp.server:61] - [Trace - 2026-09-25T16:53:59.960Z] Sending notification 'textDocument/publishDiagnostics'
Params: {
  "uri" : "file:///Users/noah.bogart/personal/lsp-example/src/lsp/core.clj",
  "diagnostics" : [ {
    "range" : {
      "start" : {
        "line" : 6,
        "character" : 0
      },
      "end" : {
        "line" : 6,
        "character" : 15
      }
    },
    "tags" : [ ],
    "message" : "lsp.other/one-arg is called with 2 args but expects 1",
    "code" : "invalid-arity",
    "langs" : [ ],
    "severity" : 1,
    "source" : "clj-kondo"
  }, {
    "range" : {
      "start" : {
        "line" : 9,
        "character" : 9
      },
      "end" : {
        "line" : 9,
        "character" : 24
      }
    },
    "tags" : [ ],
    "message" : "lsp.other/one-arg is called with 2 args but expects 1",
    "code" : "invalid-arity",
    "langs" : [ ],
    "severity" : 1,
    "source" : "clj-kondo"
  }, {
    "range" : {
      "start" : {
        "line" : 4,
        "character" : 3
      },
      "end" : {
        "line" : 4,
        "character" : 4
      }
    },
    "severity" : 3,
    "message" : "Unused public var 'lsp.core/f'",
    "code" : "clojure-lsp/unused-public-var",
    "source" : "clojure-lsp",
    "tags" : [ 1 ]
  }, {
    "range" : {
      "start" : {
        "line" : 7,
        "character" : 11
      },
      "end" : {
        "line" : 7,
        "character" : 12
      }
    },
    "severity" : 3,
    "message" : "Unused public var 'lsp.core/R'",
    "code" : "clojure-lsp/unused-public-var",
    "source" : "clojure-lsp",
    "tags" : [ 1 ]
  } ]
}

can you try rm -rf .lsp/.cache && clojure-lsp diagnostics and check if behaves like kondo? (it's about time I add a --no-cache flag for those testings)

if you look at my terminal output in the message above that says "from the readme" (or look at the readme in the linked repo), i start with showing that clojure-lsp diagnostics correctly reports the error, and it's only once i've run clojure-lsp as an lsp from my editor does it stop flagging that

after a closer look, it seems it's a kondo cache bug: If a namespace is only used through calls inside protocol impl methods, clj-kondo doesn't load it from the cache, so invalid-arity isn't reported, reproed as:

$ echo '(ns repro (:require [clojure.string :as str])) (defrecord R [] Object (toString [_] (str/join)))' | clj-kondo --lint -
linting took 12ms, errors: 0, warnings: 0

$ git clone  && cd lsp-repro && mkdir .clj-kondo
$ clj-kondo --lint src
src/lsp/core.clj:9:10: error: lsp.other/one-arg is called with 2 args but expects 1
$ clj-kondo --lint src/lsp/core.clj
linting took 16ms, errors: 0, warnings: 0

oh thank you for the smaller repro

i'll open a github issue on clj-kondo with this