Lsp-mode: Symbol鈥檚 value as variable is void: capability

Created on 8 Dec 2018  路  9Comments  路  Source: emacs-lsp/lsp-mode

When I open a file test.sh consisting of

echo hello

and run M-x lsp, I get a message Initialized server v. 1.5.5 for file:///...; but when for example I hover on an identifier, I get a message like

Error running timer: (void-variable capability)

instead of the intended information. If I run M-x lsp-describe-thing-at-point, I get the message Symbol鈥檚 value as variable is void: capability.

Ditto in a file test.py consisting of

print(hello)

so this seems not to be language-specific.

I just updated all packages today; I have lsp-mode-20181206.2007, lsp-ui-20181205.2047, and dash-20180910.1856, on Emacs 25.1.

See also #480 which is affecting me and may be related.

I enabled error-on-debug, and haven't gotten tracebacks from this. But here's a paste from my *Messages*, thanks to lsp-print-io:

>>> pyls:22583 status:starting(async)
Content-Length: 1440

{
  "jsonrpc": "2.0",
  "method": "initialize",
  "params": {
    "processId": 21107,
    "rootPath": "/home/greg/tmp/",
    "rootUri": "file:///home/greg/tmp/",
    "capabilities": {
      "workspace": {
        "applyEdit": true,
        "executeCommand": {
          "dynamicRegistration": false
        },
        "workspaceFolders": true
      },
      "textDocument": {
        "synchronization": {
          "willSave": true,
          "didSave": true,
          "willSaveWaitUntil": true
        },
        "documentSymbol": {
          "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
            ]
          },
          "hierarchicalDocumentSymbolSupport": true
        },
        "formatting": {
          "dynamicRegistration": true
        },
        "codeAction": {
          "dynamicRegistration": true
        },
        "completion": {
          "completionItem": {
            "snippetSupport": true
          }
        }
      }
    },
    "initializationOptions": null
  },
  "id": 11
}
<<<< pyls:22583 status:starting
{
  "result": {
    "capabilities": {
      "signatureHelpProvider": {
        "triggerCharacters": [
          "(",
          ","
        ]
      },
      "completionProvider": {
        "resolveProvider": false,
        "triggerCharacters": [
          "."
        ]
      },
      "documentFormattingProvider": true,
      "hoverProvider": true,
      "documentHighlightProvider": true,
      "textDocumentSync": 2,
      "documentRangeFormattingProvider": true,
      "renameProvider": true,
      "experimental": null,
      "documentSymbolProvider": true,
      "definitionProvider": true,
      "executeCommandProvider": {
        "commands": []
      },
      "codeActionProvider": true,
      "referencesProvider": true,
      "codeLensProvider": {
        "resolveProvider": false
      }
    }
  },
  "jsonrpc": "2.0",
  "id": 11
}
>>> pyls:22583(async)
Content-Length: 68

{
  "jsonrpc": "2.0",
  "method": "initialized",
  "params": {
  }
}
>>> pyls:22583(async)
Content-Length: 234

{
  "jsonrpc": "2.0",
  "method": "textDocument/didOpen",
  "params": {
    "textDocument": {
      "uri": "file:///home/greg/tmp/test.py",
      "languageId": "python",
      "version": 0,
      "text": "print('hello')\n"
    }
  }
}
<<<< pyls:22583
{
  "jsonrpc": "2.0",
  "method": "textDocument/publishDiagnostics",
  "params": {
    "uri": "file:///home/greg/tmp/test.py",
    "diagnostics": []
  }
}
>>> pyls:22583(async)
Content-Length: 368

{
  "jsonrpc": "2.0",
  "method": "textDocument/codeAction",
  "params": {
    "textDocument": {
      "uri": "file:///home/greg/tmp/test.py"
    },
    "range": {
      "start": {
        "line": 1,
        "character": 0
      },
      "end": {
        "line": 1,
        "character": 0
      }
    },
    "context": {
      "diagnostics": []
    }
  },
  "id": 12
}
<<<< pyls:22583
{
  "result": [],
  "jsonrpc": "2.0",
  "id": 12
}
>>> pyls:22583(async)
Content-Length: 369

{
  "jsonrpc": "2.0",
  "method": "textDocument/codeAction",
  "params": {
    "textDocument": {
      "uri": "file:///home/greg/tmp/test.py"
    },
    "range": {
      "start": {
        "line": 0,
        "character": 0
      },
      "end": {
        "line": 0,
        "character": 14
      }
    },
    "context": {
      "diagnostics": []
    }
  },
  "id": 13
}
Error running timer: (void-variable capability)
<<<< pyls:22583
{
  "result": [],
  "jsonrpc": "2.0",
  "id": 13
}
>>> pyls:22583(async)
Content-Length: 235

{
  "jsonrpc": "2.0",
  "method": "textDocument/documentHighlight",
  "params": {
    "textDocument": {
      "uri": "file:///home/greg/tmp/test.py"
    },
    "position": {
      "line": 0,
      "character": 0
    }
  },
  "id": 14
}
eldoc error: (void-variable capability)
<<<< pyls:22583
{
  "result": [
    {
      "range": {
        "end": {
          "line": 0,
          "character": 5
        },
        "start": {
          "line": 0,
          "character": 0
        }
      },
      "kind": 2
    }
  ],
  "jsonrpc": "2.0",
  "id": 14
}
>>> pyls:22583(async)
Content-Length: 369

{
  "jsonrpc": "2.0",
  "method": "textDocument/codeAction",
  "params": {
    "textDocument": {
      "uri": "file:///home/greg/tmp/test.py"
    },
    "range": {
      "start": {
        "line": 0,
        "character": 0
      },
      "end": {
        "line": 0,
        "character": 14
      }
    },
    "context": {
      "diagnostics": []
    }
  },
  "id": 15
}
Error running timer: (void-variable capability)
<<<< pyls:22583
{
  "result": [],
  "jsonrpc": "2.0",
  "id": 15
}
>>> pyls:22583(async)
Content-Length: 235

{
  "jsonrpc": "2.0",
  "method": "textDocument/documentHighlight",
  "params": {
    "textDocument": {
      "uri": "file:///home/greg/tmp/test.py"
    },
    "position": {
      "line": 0,
      "character": 1
    }
  },
  "id": 16
}
eldoc error: (void-variable capability)
<<<< pyls:22583
{
  "result": [
    {
      "range": {
        "end": {
          "line": 0,
          "character": 5
        },
        "start": {
          "line": 0,
          "character": 0
        }
      },
      "kind": 2
    }
  ],
  "jsonrpc": "2.0",
  "id": 16
}
>>> pyls:22583(async)
Content-Length: 368

{
  "jsonrpc": "2.0",
  "method": "textDocument/codeAction",
  "params": {
    "textDocument": {
      "uri": "file:///home/greg/tmp/test.py"
    },
    "range": {
      "start": {
        "line": 1,
        "character": 0
      },
      "end": {
        "line": 1,
        "character": 0
      }
    },
    "context": {
      "diagnostics": []
    }
  },
  "id": 17
}
<<<< pyls:22583
{
  "result": [],
  "jsonrpc": "2.0",
  "id": 17
}
scroll-up-command: End of buffer [13 times]
Mark set [2 times]
Quit [2 times]
<C-mouse-1> is undefined
>>> pyls:22583(async)
Content-Length: 368

{
  "jsonrpc": "2.0",
  "method": "textDocument/codeAction",
  "params": {
    "textDocument": {
      "uri": "file:///home/greg/tmp/test.py"
    },
    "range": {
      "start": {
        "line": 1,
        "character": 0
      },
      "end": {
        "line": 1,
        "character": 0
      }
    },
    "context": {
      "diagnostics": []
    }
  },
  "id": 18
}
<<<< pyls:22583
{
  "result": [],
  "jsonrpc": "2.0",
  "id": 18
}
>>> pyls:22583(async)
Content-Length: 369

{
  "jsonrpc": "2.0",
  "method": "textDocument/codeAction",
  "params": {
    "textDocument": {
      "uri": "file:///home/greg/tmp/test.py"
    },
    "range": {
      "start": {
        "line": 0,
        "character": 0
      },
      "end": {
        "line": 0,
        "character": 14
      }
    },
    "context": {
      "diagnostics": []
    }
  },
  "id": 19
}
Error running timer: (void-variable capability)
<<<< pyls:22583
{
  "result": [],
  "jsonrpc": "2.0",
  "id": 19
}
or: Symbol鈥檚 value as variable is void: capability
>>> pyls:22583(async)
Content-Length: 368

{
  "jsonrpc": "2.0",
  "method": "textDocument/codeAction",
  "params": {
    "textDocument": {
      "uri": "file:///home/greg/tmp/test.py"
    },
    "range": {
      "start": {
        "line": 1,
        "character": 0
      },
      "end": {
        "line": 1,
        "character": 0
      }
    },
    "context": {
      "diagnostics": []
    }
  },
  "id": 20
}
<<<< pyls:22583
{
  "result": [],
  "jsonrpc": "2.0",
  "id": 20
}
picture gnprice

Most helpful comment

Your code behaves just like it is compiled against some old version of dash which does not allow (&plist :capability :registered-capability) syntax . Did you try find ~/.emacs.d -name "*.elc" | xargs rm?

picture yyoncho on 8 Dec 2018
❤1 🎉1

All 9 comments

I have commented in #480 . Can you try to reinstall lsp-mode. Alternatively you may delete the elc files in emacs.d - find ~/.emacs.d -name "*.elc" | xargs rm

yyoncho picture yyoncho on 8 Dec 2018

After reinstalling lsp-mode and in a freshly started Emacs, the issue still reproduces... but this time with a debugger trace!

Debugger entered--Lisp error: (void-variable capability)
  (if capability (progn (lsp--capability capability)))
  (or (if capability (progn (lsp--capability capability))) (if registered-capability (progn (lsp--registered-capability registered-capability))) (and (not capability) (not registered-capability)))
  (let ((lsp--cur-workspace it)) (or (if capability (progn (lsp--capability capability))) (if registered-capability (progn (lsp--registered-capability registered-capability))) (and (not capability) (not registered-capability))))
  (if (let ((lsp--cur-workspace it)) (or (if capability (progn (lsp--capability capability))) (if registered-capability (progn (lsp--registered-capability registered-capability))) (and (not capability) (not registered-capability)))) (progn (setq result (cons it result))))
  (let ((it (car list))) (if (let ((lsp--cur-workspace it)) (or (if capability (progn (lsp--capability capability))) (if registered-capability (progn (lsp--registered-capability registered-capability))) (and (not capability) (not registered-capability)))) (progn (setq result (cons it result)))))
  (while list (let ((it (car list))) (if (let ((lsp--cur-workspace it)) (or (if capability (progn (lsp--capability capability))) (if registered-capability (progn (lsp--registered-capability registered-capability))) (and (not capability) (not registered-capability)))) (progn (setq result (cons it result))))) (setq it-index (1+ it-index)) (setq list (cdr list)))
  (let ((list (lsp-workspaces)) (it-index 0)) (while list (let ((it (car list))) (if (let ((lsp--cur-workspace it)) (or (if capability (progn ...)) (if registered-capability (progn ...)) (and (not capability) (not registered-capability)))) (progn (setq result (cons it result))))) (setq it-index (1+ it-index)) (setq list (cdr list))))
  (let (result) (let ((list (lsp-workspaces)) (it-index 0)) (while list (let ((it (car list))) (if (let ((lsp--cur-workspace it)) (or (if capability ...) (if registered-capability ...) (and ... ...))) (progn (setq result (cons it result))))) (setq it-index (1+ it-index)) (setq list (cdr list)))) (nreverse result))
  (if :registered-capability (let (result) (let ((list (lsp-workspaces)) (it-index 0)) (while list (let ((it (car list))) (if (let (...) (or ... ... ...)) (progn (setq result ...)))) (setq it-index (1+ it-index)) (setq list (cdr list)))) (nreverse result)) (lsp-workspaces))
  (let ((:registered-capability (plist-get (cdr (assoc (plist-get msg :method) lsp-method-requirements)) :capability))) (if :registered-capability (let (result) (let ((list (lsp-workspaces)) (it-index 0)) (while list (let ((it ...)) (if (let ... ...) (progn ...))) (setq it-index (1+ it-index)) (setq list (cdr list)))) (nreverse result)) (lsp-workspaces)))
  lsp--find-workspaces-for((:jsonrpc "2.0" :method "textDocument/hover" :params (:textDocument (:uri "file:///home/greg/tmp/test.py") :position (:line 0 :character 0))))
  (and t (lsp--find-workspaces-for body))
  (let* ((target-workspaces (and t (lsp--find-workspaces-for body)))) (if target-workspaces (let* ((async-callback (lsp--create-async-callback-wrapper (length target-workspaces) callback mode (plist-get body :method))) (id (setq lsp-last-id (1+ lsp-last-id))) (body (plist-put body :id id))) (let ((list target-workspaces) (it-index 0)) (while list (let ((it ...)) (let (...) (let ... ... ...))) (setq it-index (1+ it-index)) (setq list (cdr list)))) body) (error "No workspace could handle %s" (plist-get body :method))))
  lsp--send-request-async((:jsonrpc "2.0" :method "textDocument/hover" :params (:textDocument (:uri "file:///home/greg/tmp/test.py") :position (:line 0 :character 0))) #[257 "\211\205\n\303\300\301\302$\207" ["print" 1 (1 . 6) lsp-ui-sideline--push-info] 6 "\n\n(fn INFO)"])
  lsp-ui-sideline--run()
  #[0 "\300p\232\205\301 \207" [#<buffer test.py> lsp-ui-sideline--run] 2]()
  apply(#[0 "\300p\232\205\301 \207" [#<buffer test.py> lsp-ui-sideline--run] 2] nil)
  timer-event-handler([t 0 0 200000 nil #[0 "\300p\232\205\301 \207" [#<buffer test.py> lsp-ui-sideline--run] 2] nil idle 0])

So that seems potentially informative.

gnprice picture gnprice on 8 Dec 2018

Looks like that's in the middle of this function:

(defun lsp--find-workspaces-for (msg)
  "Find all workspaces in the current that can handle MSG."
  ;; (setq my/msg msg)
  (-if-let ((&plist :capability :registered-capability)
            (cdr (assoc (plist-get msg :method) lsp-method-requirements)))
      (--filter
       (with-lsp-workspace it
         (or (when capability (lsp--capability capability))
             (when registered-capability
               (lsp--registered-capability registered-capability))
             (and (not capability) (not registered-capability))))
       (lsp-workspaces))
    (lsp-workspaces)))

(just from looking for references to lsp--capability that seem like a possible match)

Again there's clearly some magic going on with dash which I haven't read up on, and so I'm not sure how to interpret this or what the bug is.

gnprice picture gnprice on 8 Dec 2018

Your code behaves just like it is compiled against some old version of dash which does not allow (&plist :capability :registered-capability) syntax . Did you try find ~/.emacs.d -name "*.elc" | xargs rm?

yyoncho picture yyoncho on 8 Dec 2018
❤1 🎉1

Also, can you check whether you have only one version of dash installed by doing calling find-library?

yyoncho picture yyoncho on 8 Dec 2018

Hmm. I actually after first getting this error, and before reporting it, had blown away my whole ~/.emacs.d/elpa/ and reinstalled everything there. So there shouldn't be anywhere for an old dash to linger.

I ran M-x find-library dash, and it sent me to ~/.emacs.d/elpa/dash-20180910.1856/dash.el.

gnprice picture gnprice on 8 Dec 2018

I pinged you on gitter.

yyoncho picture yyoncho on 8 Dec 2018

The issue is fixed. Somehow @gnprice had previous version of dash loaded. Once we ensured that the new version of dash was loaded the issue disappeared.

yyoncho picture yyoncho on 8 Dec 2018

Thanks @yyoncho for the help debugging!

We still don't understand quite how I got into this state (at least after the reinstall I mentioned above), but these steps diagnosed it and fixed it:

  • This fragment of dash-using code gave an error, if evaluated (with C-x C-e in *scratch*):
    (-let (((&plist :capability :registered-capability) (list :capability 10 :registered-capability 10))) (list capability registered-capability))
  • Then I ran M-x eval-buffer in dash.el -- and then evaluating that same fragment gave no error
  • Then I ran M-x eval-buffer in lsp.el -- and then lsp-mode worked!
  • Also M-x byte-compile-file on lsp.el now worked with no error, i.e., #480 was resolved
  • I went back and ran M-x byte-compile-file on dash.el, and then in a fresh Emacs everything worked.
gnprice picture gnprice on 8 Dec 2018
👍1
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