fix(protowit): avoid implying valid oneofs are unsupported

Signed-off-by: Yordis Prieto <yordis.prieto@gmail.com>

Author: yordis

goworkspace/internal/protowit/errors.go

@@ -12,7 +12,7 @@ const (
 	unsupportedParameter unsupportedReason = iota + 1
 	unsupportedPackage
 	unsupportedEnum
-	unsupportedOneofShape
+	invalidOneofShape
 	unsupportedMap
 	unsupportedFieldKind
 	unsupportedMessageReference
@@ -48,8 +48,8 @@ func (r unsupportedReason) String() string {
 		return "protobuf package must contain a namespace and name"
 	case unsupportedEnum:
 		return "enums are not supported"
-	case unsupportedOneofShape:
-		return "oneof shape is not supported"
+	case invalidOneofShape:
+		return "oneof shape is invalid"
 	case unsupportedMap:
 		return "maps are not supported"
 	case unsupportedFieldKind:

goworkspace/internal/protowit/generate.go

@@ -477,7 +477,7 @@ func buildVariant(
 	if oneof.Fields().Len() == 0 {
 		return witVariant{}, &schemaError{
 			element: oneof.FullName(),
-			reason:  unsupportedOneofShape,
+			reason:  invalidOneofShape,
 			detail:  "oneof must contain at least one member",
 		}
 	}
@@ -498,7 +498,7 @@ func buildVariant(
 		if field.Cardinality() == protoreflect.Repeated {
 			return witVariant{}, &schemaError{
 				element: field.FullName(),
-				reason:  unsupportedOneofShape,
+				reason:  invalidOneofShape,
 				detail:  "oneof members cannot be repeated",
 			}
 		}