Update test cases

Author: allanrenucci

compiler/test/dotty/tools/dotc/CompilationTests.scala

@@ -182,6 +182,7 @@ class CompilationTests extends ParallelTesting {
     compileFile("../tests/neg/tailcall/tailrec.scala", defaultOptions) +
     compileFile("../tests/neg/tailcall/tailrec-2.scala", defaultOptions) +
     compileFile("../tests/neg/tailcall/tailrec-3.scala", defaultOptions) +
+    compileFile("../tests/neg/i3246.scala", scala2Mode) +
     compileDir("../tests/neg/typedIdents", defaultOptions)
   }.checkExpectedErrors()
 

tests/neg/i3246.scala

@@ -1,4 +1,4 @@
 class Test {
   def foo(x: Int) = 1
-  val bar: () => Int = foo _
+  val bar: () => Int = foo _ // error: type mismatch
 }

tests/pos-scala2/i3246.scala

@@ -4,4 +4,8 @@ class Test {
   def baz = 1
   def bam: () => Int = baz _
   def ban: () => Int = 1 _
+
+  def titi(fun: () => Unit) = ???
+  def toto(fun: => Int) = titi(fun _)
+  titi(1 _) // rejected by scalac
 }