From 419a7181e029998f784dbdf5780836e18c8cba4b Mon Sep 17 00:00:00 2001 From: Neil Mitchell Date: Sun, 13 Oct 2019 14:21:41 +0100 Subject: [PATCH] Copy the content of #159 to the setup guide (#164) Original content from @sshine --- docs/Setup.md | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/docs/Setup.md b/docs/Setup.md index 40c2f257d..bcfe46db0 100644 --- a/docs/Setup.md +++ b/docs/Setup.md @@ -36,3 +36,19 @@ Does `ghcide` alone work on the console? Did you first enter a Nix shell? Or run ## Issues with Nix If you are using packages installed by Nix, then often Nix will set `NIX_GHC_LIBDIR` to say where the libraries are installed. `ghcide` can cope with that. However, sometimes the `ghc` on your shell will actually be a shell script that sets `NIX_GHC_LIBDIR`, which `ghcide` can't find. If that happens, you need to either set `NIX_GHC_LIBDIR` (so `ghcide` can see it) or use a proper [Nix compatible wrapper](https://github.com/hercules-ci/ghcide-nix) over `ghcide`. + +## Symbol’s value as variable is void: capability + +As described [here](https://github.com/emacs-lsp/lsp-mode/issues/770#issuecomment-483540119) and [here](https://github.com/emacs-lsp/lsp-mode/issues/517#issuecomment-445448700), the default installation of `lsp-mode`, `lsp-ui`, `lsp-ui-mode` and `lsp-haskell` as described in [ghcide's "Using with Emacs" section](https://github.com/digital-asset/ghcide/#using-with-emacs) may result in the following error message: + +``` +Symbol’s value as variable is void: capability +``` + +This can be caused by either an old version of the Emacs package `dash`, or a cached `.elc` file for an old version. A fix consists of (re)moving the old package from ~/.emacs.d/elpa/ and installing it again, e.g. via M-x `package-list-packages` RET and M-x `package-install` RET `dash` RET. If this is not enough, + +``` +find ~/.emacs.d -name '*.elc' -exec rm {} \; +``` + +(which causes recompilation of all bytecode-compiled scripts.)