Add Futhark (#502)

languages.json

@@ -392,6 +392,10 @@
       "quotes": [["\\\"", "\\\""]],
       "extensions": ["fs", "fsi", "fsx", "fsscript"]
     },
+    "Futhark": {
+      "line_comment": ["--"],
+      "extensions": ["fut"]
+    },
     "GDB": {
       "name": "GDB Script",
       "line_comment": ["#"],

tests/data/futhark.fut

@@ -0,0 +1,8 @@
+-- 8 lines 2 code 3 comments 3 blanks
+
+-- this is a test file
+
+-- add two
+let f (x: i32) = x + 2
+
+let main = f -- eta expand