Parse records and keyed collection queries

src/lexer.mll

@@ -16,6 +16,14 @@ let keyword = function
   | "if" -> IF
   | "then" -> THEN
   | "else" -> ELSE
+  | "type" -> TYPE
+  | "input" -> INPUT
+  | "collection" -> COLLECTION
+  | "query" -> QUERY
+  | "filter" -> FILTER
+  | "map" -> MAP
+  | "sum" -> SUM
+  | "count" -> COUNT
   | "true" -> BOOL true
   | "false" -> BOOL false
   | text -> IDENT text