Add QuotePattern AST

compiler/src/dotty/tools/dotc/ast/TreeInfo.scala

@@ -1055,6 +1055,21 @@ trait TypedTreeInfo extends TreeInfo[Type] { self: Trees.Instance[Type] =>
       if tree.symbol.isTypeSplice then Some(tree.qualifier) else None
   }
 
+  extension (tree: tpd.Quote)
+    /** Type of the quoted expression as seen from outside the quote */
+    def bodyType(using Context): Type =
+      val quoteType = tree.tpe // `Quotes ?=> Expr[T]` or `Quotes ?=> Type[T]`
+      val exprType = quoteType.argInfos.last // `Expr[T]` or `Type[T]`
+      exprType.argInfos.head // T
+  end extension
+
+  extension (tree: tpd.QuotePattern)
+    /** Type of the quoted pattern */
+    def bodyType(using Context): Type =
+      val quoteType = tree.tpe // `Expr[T]` or `Type[T]`
+      quoteType.argInfos.head // T
+  end extension
+
   /** Extractor for not-null assertions.
    *  A not-null assertion for reference `x` has the form `x.$asInstanceOf$[x.type & T]`.
    */

compiler/src/dotty/tools/dotc/ast/Trees.scala

@@ -704,12 +704,6 @@ object Trees {
     /** Is this a type quote `'[tpe]' */
     def isTypeQuote = body.isType
 
-    /** Type of the quoted expression as seen from outside the quote */
-    def bodyType(using Context): Type =
-      val quoteType = typeOpt // `Quotes ?=> Expr[T]` or `Quotes ?=> Type[T]`
-      val exprType = quoteType.argInfos.last // `Expr[T]` or `Type[T]`
-      exprType.argInfos.head // T
-
     /** Set the type of the body of the quote */
     def withBodyType(tpe: Type)(using Context): Quote[Type] =
       val exprType = // `Expr[T]` or `Type[T]`
@@ -752,11 +746,6 @@ object Trees {
   case class QuotePattern[+T <: Untyped] private[ast] (bindings: List[Tree[T]], body: Tree[T], quotes: Tree[T])(implicit @constructorOnly src: SourceFile)
     extends PatternTree[T] {
     type ThisTree[+T <: Untyped] = QuotePattern[T]
-
-    /** Type of the quoted pattern */
-    def bodyType(using Context): Type =
-      val quoteType = typeOpt // `Expr[T]` or `Type[T]`
-      quoteType.argInfos.head // T
   }
 
   /** A tree representing a pattern splice `${ pattern }`, `$ident` or `$ident(args*)` in a quote pattern.

compiler/src/dotty/tools/dotc/printing/RefinedPrinter.scala

@@ -734,7 +734,7 @@ class RefinedPrinter(_ctx: Context) extends PlainPrinter(_ctx) {
         keywordStr("macro ") ~ toTextGlobal(call)
       case tree @ Quote(body, tags) =>
         val tagsText = (keywordStr("<") ~ toTextGlobal(tags, ", ") ~ keywordStr(">")).provided(tree.tags.nonEmpty)
-        val exprTypeText = (keywordStr("[") ~ toTextGlobal(tree.bodyType) ~ keywordStr("]")).provided(printDebug && tree.typeOpt.exists)
+        val exprTypeText = (keywordStr("[") ~ toTextGlobal(tpd.bodyType(tree.asInstanceOf[tpd.Quote])) ~ keywordStr("]")).provided(printDebug && tree.typeOpt.exists)
         val open = if (body.isTerm) keywordStr("{") else keywordStr("[")
         val close = if (body.isTerm) keywordStr("}") else keywordStr("]")
         keywordStr("'") ~ tagsText ~ exprTypeText ~ open ~ toTextGlobal(body) ~ close

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

@@ -97,7 +97,7 @@ class ReTyper(nestingLevel: Int = 0) extends Typer(nestingLevel) with ReChecking
 
   override def typedQuote(tree: untpd.Quote, pt: Type)(using Context): Tree =
     assertTyped(tree)
-    val body1 = typed(tree.body, tree.bodyType)(using quoteContext)
+    val body1 = typed(tree.body, promote(tree).bodyType)(using quoteContext)
     for tag <- tree.tags do assertTyped(tag)
     untpd.cpy.Quote(tree)(body1, tree.tags).withType(tree.typeOpt)
 
@@ -115,7 +115,7 @@ class ReTyper(nestingLevel: Int = 0) extends Typer(nestingLevel) with ReChecking
     assertTyped(tree)
     val bindings1 = tree.bindings.map(typed(_))
     val bodyCtx = quoteContext.retractMode(Mode.Pattern).addMode(Mode.QuotedPattern)
-    val body1 = typed(tree.body, tree.bodyType)(using bodyCtx)
+    val body1 = typed(tree.body, promote(tree).bodyType)(using bodyCtx)
     val quotes1 = typed(tree.quotes, defn.QuotesClass.typeRef)
     untpd.cpy.QuotePattern(tree)(bindings1, body1, quotes1).withType(tree.typeOpt)
 

compiler/src/scala/quoted/runtime/impl/QuotesImpl.scala

@@ -38,6 +38,7 @@ object QuotesImpl {
 }
 
 class QuotesImpl private (using val ctx: Context) extends Quotes, QuoteUnpickler, QuoteMatching:
+  import tpd.*
 
   private val xCheckMacro: Boolean = ctx.settings.XcheckMacros.value