question: merges fields specified by a fieldmask from one message to another . concode_field_sep String FIELD_SEPARATOR_REGEX concode_elem_sep String FIELD_PATH_SEPARATOR concode_elem_sep String FIELD_PATH_SEPARATOR_REGEX concode_elem_sep boolean replacePrimitiveFields concode_elem_sep boolean replaceMessageFields concode_elem_sep boolean replaceRepeatedFields concode_field_sep FieldMask fromJsonString concode_elem_sep boolean isValid concode_elem_sep boolean isValid concode_elem_sep boolean isValid concode_elem_sep boolean isValid concode_elem_sep boolean replaceMessageFields concode_elem_sep FieldMask fromFieldNumbers concode_elem_sep FieldMask fromFieldNumbers concode_elem_sep FieldMask union concode_elem_sep void setReplaceMessageFields concode_elem_sep FieldMask fromStringList concode_elem_sep void setReplaceRepeatedFields concode_elem_sep boolean replacePrimitiveFields concode_elem_sep FieldMask normalize concode_elem_sep FieldMask intersection concode_elem_sep String toString concode_elem_sep FieldMask fromString concode_elem_sep FieldMask fromString concode_elem_sep boolean replaceRepeatedFields concode_elem_sep String toJsonString concode_elem_sep void setReplacePrimitiveFields
target: void function ( FieldMask arg0 , Message arg1 , Message . Builder arg2 ) { merge ( arg0 , arg1 , arg2 , new MergeOptions ( ) ) ; }