derive Show and Eq, improvements to LSP

tests/Derive.newt

@@ -0,0 +1,14 @@
+module Derive
+
+import Prelude
+
+data Blah = Foo Int | Bar | Baz String
+
+derive Eq Blah
+derive Show Blah
+
+main : IO Unit
+main = do
+  printLn $ Foo 42
+  printLn $ Bar
+  printLn $ Baz "woo"

tests/Derive.newt.golden

@@ -0,0 +1,3 @@
+(Foo 42)
+Bar
+(Baz woo)

tests/ImportError.newt

@@ -0,0 +1,7 @@
+module ImportError
+
+-- test the FC are right and don't include next line
+-- TODO continue on and hit the next one.
+import Blah
+import Foo.Bar
+import Prelude

tests/ImportError.newt.fail

@@ -0,0 +1,2 @@
+*** Process tests/ImportError.newt
+ERROR at tests/ImportError.newt:5:8--5:12: error reading tests/Blah.newt: Error: ENOENT: no such file or directory, open 'tests/Blah.newt'

tests/UnsafeIO.newt

@@ -0,0 +1,8 @@
+module UnsafeIO
+
+import Prelude
+
+main : IO Unit
+main = do
+  let x = unsafePerformIO $ putStrLn "Hello, World!"
+  pure MkUnit

tests/UnsafeIO.newt.golden

@@ -0,0 +1 @@
+Hello, World!