Merge pull request #12254 from dotty-staging/fix-#12253

Add regression test

Author: nicolasstucki

tests/pos-macros/i12253/Macro_1.scala

@@ -0,0 +1,24 @@
+
+import scala.quoted.*
+import deriving.*,  compiletime.*
+
+object MacroUtils:
+  transparent inline def extractNameFromSelector[To, T](inline code: To => T) = ${extractNameFromSelectorImpl('code)}
+
+  def extractNameFromSelectorImpl[To: Type, T: Type](code: Expr[To => T])(using Quotes): Expr[String] =
+    import quotes.reflect.*
+    code.asTerm match
+      case InlinedLambda(_, Select(_, name)) => Expr(name)
+      case t => Expr("")
+
+  object InlinedLambda:
+    def unapply(using Quotes)(arg: quotes.reflect.Term): Option[(List[quotes.reflect.ValDef], quotes.reflect.Term)] =
+      import quotes.reflect.*
+      arg match
+        case Inlined(_, _, Lambda(vals, term)) => Some((vals, term))
+        case Inlined(_, _, nested) => InlinedLambda.unapply(nested)
+        case t => None
+  end InlinedLambda
+
+end MacroUtils
+

tests/pos-macros/i12253/Test_2.scala

@@ -0,0 +1,4 @@
+object Usage:
+  case class Bar(x: Int, y: String, z: (Double, Double))
+  MacroUtils.extractNameFromSelector[Bar, String](_.y + "abc")
+end Usage