Allow failures for defined parsers

.github/workflows/check-query-files-and-compilation.yml

@@ -39,6 +39,8 @@ jobs:
 
       - name: Check query files (Unix)
         if: matrix.os != 'windows-latest'
+        env:
+          ALLOWED_INSTALLATION_FAILURES: haskell
         run: nvim --headless -c "luafile ./scripts/check-queries.lua" -c "q"
 
       - name: Compile parsers Windows
@@ -53,6 +55,8 @@ jobs:
 
       - name: Check query files (Windows)
         if: matrix.os == 'windows-latest'
+        env:
+          ALLOWED_INSTALLATION_FAILURES: haskell
         run: C:\\tools\\neovim\\Neovim\\bin\\nvim.exe --headless -c "luafile ./scripts/check-queries.lua" -c "q"
 
       - uses: actions/upload-artifact@v2

scripts/check-queries.lua

@@ -58,11 +58,15 @@ end
 
 
 local ok, err = pcall(do_check)
+local allowed_to_fail = vim.split(vim.env.ALLOWED_INSTALLATION_FAILURES or '', ",", true)
 
 for k, v in pairs(require 'nvim-treesitter.parsers'.get_parser_configs()) do
   if not require 'nvim-treesitter.parsers'.has_parser(k) then
     -- On CI all parsers that can be installed from C files should be installed
-    if vim.env.CI and not v.install_info.requires_generate_from_grammar then
+    if vim.env.CI
+      and not v.install_info.requires_generate_from_grammar
+      and not vim.tbl_contains(allowed_to_fail, k) then
+
       print('Error: parser for '..k..' is not installed')
       vim.cmd('cq')
     else