SI-7852 Test to show the status quo bytecode for "" == ...

Will be somewhat leaner after the next commit.

3 files changed, 51 insertions, 0 deletions

diff --git a/test/files/run/t7852.check b/test/files/run/t7852.check
new file mode 100644
index 0000000000..fdced88fa8
--- /dev/null
+++ b/test/files/run/t7852.check
@@ -0,0 +1,30 @@
+class scala.tools.asm.tree.MethodNode
+    LDC ""
+    ALOAD 0
+    INVOKEVIRTUAL java/lang/Object.toString ()Ljava/lang/String;
+    ASTORE 1
+    DUP
+    IFNONNULL L0
+    POP
+    ALOAD 1
+    IFNULL L1
+    GOTO L2
+   L0
+   FRAME FULL [Lean java/lang/String] [java/lang/String]
+    ALOAD 1
+    INVOKEVIRTUAL java/lang/Object.equals (Ljava/lang/Object;)Z
+    IFEQ L2
+   L1
+   FRAME SAME
+    ICONST_1
+    GOTO L3
+   L2
+   FRAME SAME
+    ICONST_0
+   L3
+   FRAME SAME1 I
+    POP
+    RETURN
+    MAXSTACK = 2
+    MAXLOCALS = 2
+
diff --git a/test/files/run/t7852.flags b/test/files/run/t7852.flags
new file mode 100644
index 0000000000..f6262fd3e0
--- /dev/null
+++ b/test/files/run/t7852.flags
@@ -0,0 +1 @@
+-Ynooptimise
diff --git a/test/files/run/t7852.scala b/test/files/run/t7852.scala
new file mode 100644
index 0000000000..eed211c7bc
--- /dev/null
+++ b/test/files/run/t7852.scala
@@ -0,0 +1,20 @@
+import scala.tools.partest.BytecodeTest
+import scala.tools.asm.util._
+import scala.tools.nsc.util.stringFromWriter
+
+object Test extends BytecodeTest {
+  def show {
+    val classNode = loadClassNode("Lean")
+    val meth = getMethod(classNode, "foo")
+    println(meth.getClass)
+    val textifier = new Textifier()
+    meth.accept(new TraceMethodVisitor(textifier))
+    println(stringFromWriter(w => textifier.print(w)))
+  }
+}
+
+class Lean {
+  def foo {
+    "" == toString
+  }
+}