SI-8148 fix anonymous functions with placeholders

Quasiquotes used to fail to generate proper fresh identifiers for
anonymous functions like:

  q"_ + _"

Due to improper initialization of FreshNameCreator in quasiquote
parser which was erroneously not preserved throughout parsing of
the code snippet but re-created on every invocation.

2 files changed, 7 insertions, 2 deletions

diff --git a/src/compiler/scala/tools/reflect/quasiquotes/Parsers.scala b/src/compiler/scala/tools/reflect/quasiquotes/Parsers.scala
index 6e6b617e5c..1bd9323752 100644
--- a/src/compiler/scala/tools/reflect/quasiquotes/Parsers.scala
+++ b/src/compiler/scala/tools/reflect/quasiquotes/Parsers.scala
@@ -55,7 +55,7 @@ trait Parsers { self: Quasiquotes =>
 
       def isHole(name: Name): Boolean = holeMap.contains(name)
 
-      override implicit def fresh: FreshNameCreator = new FreshNameCreator(nme.QUASIQUOTE_PREFIX)
+      override implicit lazy val fresh: FreshNameCreator = new FreshNameCreator(nme.QUASIQUOTE_PREFIX)
 
       override val treeBuilder = new ParserTreeBuilder {
         override implicit def fresh: FreshNameCreator = parser.fresh
@@ -193,4 +193,4 @@ trait Parsers { self: Quasiquotes =>
   }
 
   object FreshName extends FreshNameExtractor(nme.QUASIQUOTE_PREFIX)
-}
\ No newline at end of file
+}
diff --git a/test/files/scalacheck/quasiquotes/TermConstructionProps.scala b/test/files/scalacheck/quasiquotes/TermConstructionProps.scala
index 6fb05ff9a4..38fbfa9f7f 100644
--- a/test/files/scalacheck/quasiquotes/TermConstructionProps.scala
+++ b/test/files/scalacheck/quasiquotes/TermConstructionProps.scala
@@ -224,4 +224,9 @@ object TermConstructionProps extends QuasiquoteProperties("term construction") {
   property("SI-8009") = test {
     q"`foo`".asInstanceOf[reflect.internal.SymbolTable#Ident].isBackquoted
   }
+
+  property("SI-8148") = test {
+    val q"($a, $b) => $_" = q"_ + _"
+    assert(a.name != b.name)
+  }
 }