Added warning when someone tries to return a no...

Added warning when someone tries to return a non-Unit value from a Unit
method, no review.

3 files changed, 16 insertions, 0 deletions

diff --git a/test/files/neg/unit-returns-value.check b/test/files/neg/unit-returns-value.check
new file mode 100644
index 0000000000..18368f45ab
--- /dev/null
+++ b/test/files/neg/unit-returns-value.check
@@ -0,0 +1,4 @@
+unit-returns-value.scala:4: error: enclosing method f has result type Unit: return value discarded
+    if (b) return 5
+           ^
+one error found
diff --git a/test/files/neg/unit-returns-value.flags b/test/files/neg/unit-returns-value.flags
new file mode 100644
index 0000000000..e8fb65d50c
--- /dev/null
+++ b/test/files/neg/unit-returns-value.flags
@@ -0,0 +1 @@
+-Xfatal-warnings
\ No newline at end of file
diff --git a/test/files/neg/unit-returns-value.scala b/test/files/neg/unit-returns-value.scala
new file mode 100644
index 0000000000..27a1111c5b
--- /dev/null
+++ b/test/files/neg/unit-returns-value.scala
@@ -0,0 +1,11 @@
+object Test {
+  def f {
+    var b = false
+    if (b) return 5
+  }
+
+  // no warning
+  def g {
+    return println("hello")
+  }
+}