SI-7584 Test and spurious warning fix for by-name closures

The enclosed test case exercises by-name closures, which were
the subject of the previous commit. In the process, a spurious
warning was eliminated.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/reflect/scala/reflect/internal/TreeInfo.scala b/src/reflect/scala/reflect/internal/TreeInfo.scala
index a5cf46071f..cd1f5f2e47 100644
--- a/src/reflect/scala/reflect/internal/TreeInfo.scala
+++ b/src/reflect/scala/reflect/internal/TreeInfo.scala
@@ -208,7 +208,7 @@ abstract class TreeInfo {
       }
       def isWarnableSymbol = {
         val sym = tree.symbol
-        (sym == null) || !(sym.isModule || sym.isLazy) || {
+        (sym == null) || !(sym.isModule || sym.isLazy || definitions.isByNameParamType(sym.tpe_*)) || {
           debuglog("'Pure' but side-effecting expression in statement position: " + tree)
           false
         }