Fix KT-51478

The issue was that, when various context elements were available
to fulfill a need for an extension receiver, but none of them were
applicable to it, the compiler behaved the same way as if there
was no extension receiver at all.

https://youtrack.jetbrains.com/issue/KT-51478/Inapplicable-receiver-diagnostic-expected-when-there-are-two-context-receiver-candidates

compiler/resolution/src/org/jetbrains/kotlin/resolve/calls/components/ResolutionParts.kt

@@ -704,7 +704,10 @@ internal object CheckReceivers : ResolutionPart() {
         val extensionReceiverParameter = candidateDescriptor.extensionReceiverParameter ?: return null
         val compatible = receiverCandidates.mapNotNull { getReceiverArgumentWithConstraintIfCompatible(it, extensionReceiverParameter) }
         return when (compatible.size) {
-            0 -> null
+            0 -> {
+                addDiagnostic(NoMatchingContextReceiver())
+                null
+            }
             1 -> compatible.single().argument
             else -> {
                 addDiagnostic(ContextReceiverAmbiguity())
@@ -954,4 +957,4 @@ internal object CheckIncompatibleTypeVariableUpperBounds : ResolutionPart() {
             }
         }
     }
-}
+}

compiler/resolution/src/org/jetbrains/kotlin/resolve/calls/tower/ImplicitScopeTower.kt

@@ -114,6 +114,12 @@ abstract class ResolutionDiagnostic(candidateApplicability: CandidateApplicabili
     }
 }
 
+class NoMatchingContextReceiver : ResolutionDiagnostic(INAPPLICABLE_WRONG_RECEIVER) {
+    override fun report(reporter: DiagnosticReporter) {
+        reporter.onCall(this)
+    }
+}
+
 class ContextReceiverAmbiguity : ResolutionDiagnostic(RESOLVED_WITH_ERROR) {
     override fun report(reporter: DiagnosticReporter) {
         reporter.onCall(this)