(1) added readLong to Console.

(2) added print/read methods to Predef
(3) added warnings for non-sensical comparisons

2 files changed, 54 insertions, 0 deletions

diff --git a/test/files/neg/checksensible.check b/test/files/neg/checksensible.check
new file mode 100644
index 0000000000..a4cf1cfe41
--- /dev/null
+++ b/test/files/neg/checksensible.check
@@ -0,0 +1,28 @@
+checksensible.scala:4: warning: comparing values of types scala.Ordered[scala.Unit] and scala.Unit using `>' will always yield false
+  println((c = 1) > 0)
+                  ^
+checksensible.scala:5: warning: comparing values of types scala.Ordered[scala.Unit] and scala.Unit using `<=' will always yield true
+  println((c = 1) <= 0)
+                  ^
+checksensible.scala:6: warning: comparing values of types scala.Unit and scala.Int using `==' will always yield false
+  println((c = 1) == 0)
+                  ^
+checksensible.scala:8: warning: comparing values of types scala.Int and java.lang.String using `==' will always yield false
+  println(1 == "abc")
+            ^
+checksensible.scala:9: warning: comparing values of types scala.Int and scala.Boolean using `!=' will always yield true
+  println(1 != true)
+            ^
+checksensible.scala:11: warning: comparing a fresh object using `==' will always yield false
+  println(((x: int) => x + 1) == null)
+                              ^
+checksensible.scala:12: warning: comparing a fresh object using `==' will always yield false
+  println(new Object == new Object)
+                     ^
+checksensible.scala:13: warning: comparing a fresh object using `!=' will always yield true
+  println(new Array(1) != new Array(1))
+                       ^
+checksensible.scala:20: warning: comparing values of types scala.Unit and scala.Int using `!=' will always yield true
+    while((c = in.read) != -1) {
+                        ^
+9 warnings found
diff --git a/test/files/neg/checksensible.scala b/test/files/neg/checksensible.scala
new file mode 100644
index 0000000000..1a2c4425fd
--- /dev/null
+++ b/test/files/neg/checksensible.scala
@@ -0,0 +1,26 @@
+import java.io._
+object Test {
+  var c = 0
+  println((c = 1) > 0)
+  println((c = 1) <= 0)
+  println((c = 1) == 0)
+
+  println(1 == "abc")
+  println(1 != true)
+
+  println(((x: int) => x + 1) == null)
+  println(new Object == new Object)
+  println(new Array(1) != new Array(1))
+
+  def main(args: Array[String]) = {
+    val in = new FileInputStream(args(0))
+
+    var c = 0
+
+    while((c = in.read) != -1) {
+      Console.print(c.toChar)
+    }
+
+    in.close
+  }
+}