Use parameter span for type match _

Author: nicolasstucki

compiler/src/dotty/tools/dotc/typer/Inliner.scala

@@ -444,11 +444,13 @@ class Inliner(call: tpd.Tree, rhsToInline: tpd.Tree)(implicit ctx: Context) {
             case _ => tree
           }
         case tree: Ident =>
+          /* The span of the argument or the span of the tree is the tree is a type match `_` */
+          def span = paramSpan.getOrElse(tree.name, tree.span)
           paramProxy.get(tree.tpe) match {
             case Some(t) if tree.isTerm && t.isSingleton =>
-              singleton(t.dealias).withSpan(paramSpan(tree.name))
+              singleton(t.dealias).withSpan(span)
             case Some(t) if tree.isType =>
-              TypeTree(t).withSpan(paramSpan(tree.name))
+              TypeTree(t).withSpan(span)
             case _ => tree
           }
         case tree => tree