add quotes around field name in required field error

genmethod.go

@@ -181,7 +181,7 @@ func (m *marshalMethod) unmarshalConversions(from, to Var, format string) (s []S
 				Body:      m.convert(accessFrom, accessTo, f.typ, f.origTyp),
 			})
 		} else {
-			err := fmt.Sprintf("missing required field %s for %s", f.encodedName(format), m.mtyp.name)
+			err := fmt.Sprintf("missing required field '%s' for %s", f.encodedName(format), m.mtyp.name)
 			errors := m.scope.parent.packageName("errors")
 			s = append(s, If{
 				Condition: Equals{Lhs: accessFrom, Rhs: NIL},

internal/tests/mapconv/output.go

@@ -35,14 +35,14 @@ func (x *X) UnmarshalJSON(input []byte) error {
 	}
 	var x0 X
 	if dec.Map == nil {
-		return errors.New("missing required field map for X")
+		return errors.New("missing required field 'map' for X")
 	}
 	x0.Map = make(map[string]int, len(dec.Map))
 	for k, v := range dec.Map {
 		x0.Map[string(k)] = int(v)
 	}
 	if dec.Named == nil {
-		return errors.New("missing required field named for X")
+		return errors.New("missing required field 'named' for X")
 	}
 	x0.Named = make(namedMap, len(dec.Named))
 	for k, v := range dec.Named {
@@ -80,14 +80,14 @@ func (x *X) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	}
 	var x0 X
 	if dec.Map == nil {
-		return errors.New("missing required field map for X")
+		return errors.New("missing required field 'map' for X")
 	}
 	x0.Map = make(map[string]int, len(dec.Map))
 	for k, v := range dec.Map {
 		x0.Map[string(k)] = int(v)
 	}
 	if dec.Named == nil {
-		return errors.New("missing required field named for X")
+		return errors.New("missing required field 'named' for X")
 	}
 	x0.Named = make(namedMap, len(dec.Named))
 	for k, v := range dec.Named {

internal/tests/sliceconv/output.go

@@ -35,14 +35,14 @@ func (x *X) UnmarshalJSON(input []byte) error {
 	}
 	var x0 X
 	if dec.Slice == nil {
-		return errors.New("missing required field slice for X")
+		return errors.New("missing required field 'slice' for X")
 	}
 	x0.Slice = make([]int, len(dec.Slice))
 	for k, v := range dec.Slice {
 		x0.Slice[k] = int(v)
 	}
 	if dec.Named == nil {
-		return errors.New("missing required field named for X")
+		return errors.New("missing required field 'named' for X")
 	}
 	x0.Named = make(namedSlice, len(dec.Named))
 	for k, v := range dec.Named {
@@ -80,14 +80,14 @@ func (x *X) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	}
 	var x0 X
 	if dec.Slice == nil {
-		return errors.New("missing required field slice for X")
+		return errors.New("missing required field 'slice' for X")
 	}
 	x0.Slice = make([]int, len(dec.Slice))
 	for k, v := range dec.Slice {
 		x0.Slice[k] = int(v)
 	}
 	if dec.Named == nil {
-		return errors.New("missing required field named for X")
+		return errors.New("missing required field 'named' for X")
 	}
 	x0.Named = make(namedSlice, len(dec.Named))
 	for k, v := range dec.Named {