Add regression tests (#18240)

Closes #18228

Author: nicolasstucki

tests/neg-macros/i18228.scala

@@ -0,0 +1,13 @@
+import scala.quoted.*
+
+case class QueryMeta[T](map: Map[String, String])
+
+object QueryMeta:
+  given [T]: FromExpr[QueryMeta[T]] = new FromExpr[QueryMeta[T]]:
+    def unapply(expr: Expr[QueryMeta[T]])(using q: Quotes): Option[QueryMeta[T]] =
+      import q.reflect.*
+      expr match
+        case '{ QueryMeta/*[T]*/(${ map }: Map[String, String]) } => // error: Reference to T within quotes requires a given scala.quoted.Type[T] in scope.
+          map.value.map(QueryMeta[T].apply)
+        case _ =>
+          None

tests/pos-macros/i18228.scala

@@ -0,0 +1,13 @@
+import scala.quoted.*
+
+case class QueryMeta[T](map: Map[String, String])
+
+object QueryMeta:
+  given [T: Type]: FromExpr[QueryMeta[T]] = new FromExpr[QueryMeta[T]]:
+    def unapply(expr: Expr[QueryMeta[T]])(using q: Quotes): Option[QueryMeta[T]] =
+      import q.reflect.*
+      expr match
+        case '{ QueryMeta[t](${ map }: Map[String, String]) } =>
+          map.value.map(QueryMeta[T].apply)
+        case _ =>
+          None

tests/pos-macros/i18228b.scala

@@ -0,0 +1,13 @@
+import scala.quoted.*
+
+case class QueryMeta[T](map: Map[String, String])
+
+object QueryMeta:
+  given [T]: FromExpr[QueryMeta[T]] = new FromExpr[QueryMeta[T]]:
+    def unapply(expr: Expr[QueryMeta[T]])(using q: Quotes): Option[QueryMeta[T]] =
+      import q.reflect.*
+      expr match
+        case '{ QueryMeta[t](${ map }: Map[String, String]) } =>
+          map.value.map(QueryMeta[T].apply)
+        case _ =>
+          None