SI-7185 Avoid NPE in TreeInfo.isExprSafeToInline

We got there typechecking code with a redundant
layer of Block.

We can't express that in source code, so we test
this with manual tree construction and with XML
literals, which as reported produce such trees.

1 files changed, 12 insertions, 0 deletions

diff --git a/test/files/run/t7185.scala b/test/files/run/t7185.scala
new file mode 100644
index 0000000000..d9d913e78a
--- /dev/null
+++ b/test/files/run/t7185.scala
@@ -0,0 +1,12 @@
+import scala.tools.partest.ReplTest
+
+object Test extends ReplTest {
+  override def code = """
+import scala.tools.reflect.ToolBox
+import scala.reflect.runtime.universe._
+object O { def apply() = 0 }
+val ORef = reify { O }.tree
+val tree = Apply(Block(Nil, Block(Nil, ORef)), Nil)
+{val tb = reflect.runtime.currentMirror.mkToolBox(); tb.typeCheck(tree): Any}
+"""
+}