Merge pull request #6600 from dotty-staging/fail-fast-for-non-reified-quotes

Fail at compile time if quote is not reified

Author: nicolasstucki

library/src-3.x/scala/internal/Quoted.scala

@@ -1,27 +1,28 @@
 package scala.internal
 
-import scala.annotation.Annotation
+import scala.annotation.{Annotation, compileTimeOnly}
 import scala.quoted._
 
 object Quoted {
 
   /** A term quote is desugared by the compiler into a call to this method */
-  def exprQuote[T](x: T): Expr[T] =
-    throw new Error("Internal error: this method call should have been replaced by the compiler")
+  @compileTimeOnly("Illegal reference to `scala.internal.Quoted.exprQuote`")
+  def exprQuote[T](x: T): Expr[T] = ???
 
   /** A term splice is desugared by the compiler into a call to this method */
-  def exprSplice[T](x: Expr[T]): T =
-    throw new Error("Internal error: this method call should have been replaced by the compiler")
+  @compileTimeOnly("Illegal reference to `scala.internal.Quoted.exprSplice`")
+  def exprSplice[T](x: Expr[T]): T = ???
 
   /** A type quote is desugared by the compiler into a call to this method */
-  def typeQuote[T <: AnyKind]: Type[T] =
-    throw new Error("Internal error: this method call should have been replaced by the compiler")
+  @compileTimeOnly("Illegal reference to `scala.internal.Quoted.typeQuote`")
+  def typeQuote[T <: AnyKind]: Type[T] = ???
 
   /** A splice in a quoted pattern is desugared by the compiler into a call to this method */
-  def patternHole[T]: T =
-    throw new Error("Internal error: this method call should have been replaced by the compiler")
+  @compileTimeOnly("Illegal reference to `scala.internal.Quoted.patternHole`")
+  def patternHole[T]: T = ???
 
   /** A splice of a name in a quoted pattern is desugared by wrapping getting this annotation */
+  @compileTimeOnly("Illegal reference to `scala.internal.Quoted.patternBindHole`")
   class patternBindHole extends Annotation
 
 }