Add a .check file

Author: cb372

tests/neg/warn-value-discard.check

@@ -0,0 +1,8 @@
+-- [E171] Potential Issue Error: tests/neg/warn-value-discard.scala:14:35 ----------------------------------------------
+14 |  firstThing().map(_ => secondThing()) // error
+   |                        ^^^^^^^^^^^^^
+   |                        discarded non-Unit value of type Either[Failed, Unit]
+-- [E171] Potential Issue Error: tests/neg/warn-value-discard.scala:17:35 ----------------------------------------------
+17 |  firstThing().map(_ => secondThing()) // error
+   |                        ^^^^^^^^^^^^^
+   |                        discarded non-Unit value of type Either[Failed, Unit]

tests/neg/warn-value-discard.scala

@@ -4,15 +4,15 @@ import scala.util.{Either, Right, Left}
 
 case class Failed(msg: String)
 
-def doSomething(): Either[Failed, Unit] =
+def firstThing(): Either[Failed, Unit] =
   Right(())
 
-def log(): Either[Failed, Unit] =
+def secondThing(): Either[Failed, Unit] =
   Left(Failed("whoops you should have flatMapped me"))
 
 def singleExpr(): Either[Failed, Unit] =
-  doSomething().map(_ => log()) // error
+  firstThing().map(_ => secondThing()) // error
 
 def block(): Either[Failed, Unit] = {
-  doSomething().map(_ => log()) // error
+  firstThing().map(_ => secondThing()) // error
 }