[ test ] Add test for #490

Author: spcfox

tests/idris2/linear/linear019/Issue490.idr

@@ -0,0 +1,7 @@
+data MyList : Type -> Type where
+  Nil : {a : Type} -> MyList a
+  (::) : {a : Type} -> a -> MyList a -> MyList a
+
+g : MyList a -> ()
+g [] = ()
+g l@(x :: xs) = ?hole

tests/idris2/linear/linear019/expected

@@ -0,0 +1,9 @@
+1/1: Building Issue490 (Issue490.idr)
+Main>    a : Type
+   x : a
+   xs : MyList a
+   l : MyList a
+------------------------------
+hole : ()
+Main> 
+Bye for now!

tests/idris2/linear/linear019/input

@@ -0,0 +1 @@
+:t hole

tests/idris2/linear/linear019/run

@@ -0,0 +1,3 @@
+. ../../../testutils.sh
+
+idris2 Issue490.idr < input