diff --git a/tools/lsp/squirrel/grammar/camligo/grammar.js b/tools/lsp/squirrel/grammar/camligo/grammar.js
index 7d1ebbd7e..c11c94315 100644
--- a/tools/lsp/squirrel/grammar/camligo/grammar.js
+++ b/tools/lsp/squirrel/grammar/camligo/grammar.js
@@ -11,7 +11,7 @@ function mkOp($, opExpr) {
 
 module.exports = grammar({
   name: 'CameLigo',
-  word: $ => $.Keyword,
+  word:   $ => $.Keyword,
   extras: $ => [$.ocaml_comment, $.comment, /\s/],
 
   rules: {
@@ -23,52 +23,47 @@ module.exports = grammar({
       $.include,
     ),
 
-    include: $ => seq('#include', field("filename", $.String)),
+    include: $ => seq(
+      '#include',
+      field("filename", $.String)
+    ),
 
     _attribute: $ => /\[@@[a-z]+\]/,
 
-    argument: $ => seq(
-      "(",
-      field("argPattern", $._pattern),
-      ":",
-      field("annotExpr", $.type_expr),
-      ")"
-    ),
-
     let_decl: $ => seq(
       "let",
-      field("binder", $._binder),
+      field("name", $._binder),
       optional(seq(
         ":",
-        field("annotExpr", $.type_expr)
+        field("type", $.type_expr)
       )),
       "=",
-      field("letExpr",$._let_expr),
+      field("body",$._program),
       repeat(field("attribute", $._attribute))
     ),
 
     _binder: $ => choice(
-      field("letBinds", $.let_binds),
-      field("letPat", $._pattern)
+      $.func_header,
+      $._pattern
     ),
 
     //========== EXPR ============
 
-    _let_expr: $ => choice(
+    _program: $ => choice(
       $.let_expr1,
       $._expr
     ),
 
-    let_binds: $ => prec(1, seq(
+    func_header: $ => prec(1, seq(
       optional(field("recursive", "rec")),
-      field("bindName", $.Name),
-      repeat(field("bindArgument", $.argument))
+      field("name", $.Name),
+      repeat(field("arg", $.paren_pattern))
     )),
 
     let_expr1: $ => seq(
       $.let_decl,
       "in",
-      field("innerExpr", $._let_expr)
+      field("innerExpr", $._program)
     ),
 
     // [1;2]
@@ -171,10 +166,10 @@ module.exports = grammar({
       "if",
       field("condition", $._expr),
       "then",
-      field("thenBranch", $._let_expr),
+      field("thenBranch", $._program),
       optional(seq(
         "else",
-        field("elseBranch", $._let_expr)
+        field("elseBranch", $._program)
       ))
     )),
 
@@ -191,12 +186,12 @@ module.exports = grammar({
     matching: $ => seq(
       field("pattern", $._pattern),
       "->",
-      field("matchingExpr", $._let_expr)
+      field("matchingExpr", $._program)
     ),
 
     lambda_expr: $ => seq(
       "fun",
-      repeat1(field("arg", $.argument)),
+      repeat1(field("arg", $.paren_pattern)),
       "->",
       field("body", $._expr)
     ),
@@ -236,13 +231,13 @@ module.exports = grammar({
 
     block_expr: $ => seq(
       "begin",
-      sepBy(";", field("elem", $._let_expr)),
+      sepBy(";", field("elem", $._program)),
       "end",
     ),
 
     paren_expr: $ => seq(
       "(",
-      field("innerExpr", $._let_expr),
+      field("innerExpr", $._program),
       optional(seq(
         ":",
         field("annotExpr", $.type_expr)
diff --git a/tools/lsp/squirrel/src/AST/Camligo/Parser.hs b/tools/lsp/squirrel/src/AST/Camligo/Parser.hs
index 0783697f9..3df1b998d 100644
--- a/tools/lsp/squirrel/src/AST/Camligo/Parser.hs
+++ b/tools/lsp/squirrel/src/AST/Camligo/Parser.hs
@@ -13,4 +13,17 @@ import Product
 import Parser
 import ParseTree
 
--- import Debug.Trace
\ No newline at end of file
+-- import Debug.Trace
+
+example :: FilePath
+example = "../../../src/test/contracts/address.mligo"
+
+raw :: IO ()
+raw = toParseTree (Path example)
+  >>= print . pp
+
+-- sample :: IO ()
+-- sample
+--   =   toParseTree (Path example)
+--   >>= runParserM . recognise
+--   >>= print . pp . fst
diff --git a/tools/lsp/squirrel/src/AST/Pascaligo/Parser.hs b/tools/lsp/squirrel/src/AST/Pascaligo/Parser.hs
index 8b75126e8..7cf3e7d04 100644
--- a/tools/lsp/squirrel/src/AST/Pascaligo/Parser.hs
+++ b/tools/lsp/squirrel/src/AST/Pascaligo/Parser.hs
@@ -15,7 +15,7 @@ import ParseTree
 
 -- import Debug.Trace
 
-example :: FilePath
+-- example :: FilePath
 -- example = "../../../src/test/contracts/arithmetic.ligo"
 -- example = "../../../src/test/contracts/address.ligo"
 -- example = "../../../src/test/contracts/annotation.ligo"
@@ -36,7 +36,6 @@ example :: FilePath
 -- example = "../../../src/test/contracts/bytes_arithmetic.ligo"
 -- example = "../../../src/test/contracts/chain_id.ligo"
 -- example = "../../../src/test/contracts/closure-3.ligo"
-example = "../../../src/test/contracts/coase.ligo"
 
 sample' :: FilePath -> IO (LIGO Info)
 sample' f
@@ -49,16 +48,16 @@ source' f
   =   toParseTree (Path f)
   >>= print . pp
 
-sample :: IO ()
-sample
-  =   toParseTree (Path example)
-  >>= runParserM . recognise
-  >>= print . pp . fst
+-- sample :: IO ()
+-- sample
+--   =   toParseTree (Path example)
+--   >>= runParserM . recognise
+--   >>= print . pp . fst
 
-source :: IO ()
-source
-  =   toParseTree (Path example)
-  >>= print . pp
+-- source :: IO ()
+-- source
+--   =   toParseTree (Path example)
+--   >>= print . pp
 
 recognise :: RawTree -> ParserM (LIGO Info)
 recognise = descent (\_ -> error . show . pp) $ map usingScope
diff --git a/tools/lsp/squirrel/src/Extension.hs b/tools/lsp/squirrel/src/Extension.hs
index 8359dcdc8..bcc73c3a0 100644
--- a/tools/lsp/squirrel/src/Extension.hs
+++ b/tools/lsp/squirrel/src/Extension.hs
@@ -23,9 +23,9 @@ data UnsupportedExtension = UnsupportedExtension String
 getExt :: MonadThrow m => FilePath -> m Ext
 getExt path = do
   case takeExtension path of
-    "religo" -> return Reason
-    "ligo"   -> return Pascal
-    "mligo"  -> return Caml
+    ".religo" -> return Reason
+    ".ligo"   -> return Pascal
+    ".mligo"  -> return Caml
     ext      -> throwM $ UnsupportedExtension ext
 
 onExt :: ElimExt a -> FilePath -> IO a
diff --git a/tools/lsp/squirrel/src/ParseTree.hs b/tools/lsp/squirrel/src/ParseTree.hs
index c187bad4e..260cfc425 100644
--- a/tools/lsp/squirrel/src/ParseTree.hs
+++ b/tools/lsp/squirrel/src/ParseTree.hs
@@ -113,10 +113,8 @@ toParseTree = unsafeDebounce \fin -> do
     } (srcPath fin)
 
   parser <- ts_parser_new
-  -- True   <- ts_parser_set_language parser tree_sitter_PascaLigo
-  True <- ts_parser_set_language parser language
-
-  src <- srcToBytestring fin
+  True   <- ts_parser_set_language parser language
+  src    <- srcToBytestring fin
 
   BS.useAsCStringLen src \(str, len) -> do
     tree <- ts_parser_parse_string parser nullPtr str len
@@ -136,7 +134,7 @@ toParseTree = unsafeDebounce \fin -> do
           trees <- for nodes \node' -> do
             (only -> (r :> _, tree :: ParseTree RawTree)) <- go fin src node'
             field <-
-              if nodeFieldName node' == nullPtr
+              if   nodeFieldName node' == nullPtr
               then return ""
               else peekCString $ nodeFieldName node'
             return $ make (r :> Text.pack field :> Nil, tree)
@@ -146,7 +144,7 @@ toParseTree = unsafeDebounce \fin -> do
           let
             start2D  = nodeStartPoint node
             finish2D = nodeEndPoint   node
-            i = fromIntegral
+            i        = fromIntegral
 
           let
             range = Range
@@ -166,7 +164,6 @@ toParseTree = unsafeDebounce \fin -> do
 
           return $ make (range :> "" :> Nil, ParseTree
             { ptName     = Text.pack ty
-            -- , ptChildren = fromList . fmap (Comment,) $ trees -- TODO
             , ptChildren = trees
             , ptSource   = cutOut range src
             })