Error message for none of the overloaded...

This error message allows us to keep track of all the possible alternatives.

Author: Duhemm

compiler/src/dotty/tools/dotc/reporting/diagnostic/ErrorMessageID.java

@@ -140,7 +140,8 @@ public enum ErrorMessageID {
  TraitCompanionWithMutableStaticID,
  LazyStaticFieldID,
  StaticOverridingNonStaticMembersID,
- OverloadInRefinementID
+ OverloadInRefinementID,
+ NoMatchingOverloadID
  ;
 
  public int errorNumber() {

compiler/src/dotty/tools/dotc/reporting/diagnostic/messages.scala

@@ -23,6 +23,7 @@ import dotty.tools.dotc.ast.Trees
 import dotty.tools.dotc.config.ScalaVersion
 import dotty.tools.dotc.core.Flags._
 import dotty.tools.dotc.core.SymDenotations.SymDenotation
+import dotty.tools.dotc.typer.ErrorReporting.Errors
 import scala.util.control.NonFatal
 
 object messages {
@@ -1382,7 +1383,7 @@ object messages {
  }
 
  case class AmbiguousOverload(tree: tpd.Tree, alts: List[SingleDenotation], pt: Type)(
- err: typer.ErrorReporting.Errors)(
+ err: Errors)(
  implicit ctx: Context)
  extends Message(AmbiguousOverloadID) {
 
@@ -1463,7 +1464,7 @@ object messages {
  }
 
  case class DoesNotConformToBound(tpe: Type, which: String, bound: Type)(
- err: typer.ErrorReporting.Errors)(implicit ctx: Context)
+ err: Errors)(implicit ctx: Context)
  extends Message(DoesNotConformToBoundID) {
  val msg: String = hl"Type argument ${tpe} does not conform to $which bound $bound ${err.whyNoMatchStr(tpe, bound)}"
  val kind: String = "Type Mismatch"
@@ -2181,4 +2182,14 @@ object messages {
  hl"""The refinement `$rsym` introduces an overloaded definition.
  |Refinements cannot contain overloaded definitions.""".stripMargin
  }
+
+ case class NoMatchingOverload(alternatives: List[SingleDenotation], pt: Type)(
+ err: Errors)(implicit val ctx: Context)
+ extends Message(NoMatchingOverloadID) {
+ val msg: String =
+ hl"""None of the ${err.overloadedAltsStr(alternatives)}
+ |match ${err.expectedTypeStr(pt)}"""
+ val kind: String = "Type Mismatch"
+ val explanation: String = ""
+ }
 }

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

@@ -2234,9 +2234,7 @@ class Typer extends Namer
  readaptSimplified(tree.withType(alt))
  case Nil =>
  def noMatches =
- errorTree(tree,
- em"""none of the ${err.overloadedAltsStr(altDenots)}
- |match ${err.expectedTypeStr(pt)}""")
+ errorTree(tree, NoMatchingOverload(altDenots, pt)(err))
  def hasEmptyParams(denot: SingleDenotation) = denot.info.paramInfoss == ListOfNil
  pt match {
  case pt: FunProto =>