Implemented reading from struct fields

src/errors/UnknownStructField.go

@@ -0,0 +1,19 @@
+package errors
+
+import "fmt"
+
+// UnknownStructField represents unknown struct fields.
+type UnknownStructField struct {
+	StructName       string
+	FieldName        string
+	CorrectFieldName string
+}
+
+// Error generates the string representation.
+func (err *UnknownStructField) Error() string {
+	if err.CorrectFieldName != "" {
+		return fmt.Sprintf("Unknown struct field '%s' in '%s', did you mean '%s'?", err.FieldName, err.StructName, err.CorrectFieldName)
+	}
+
+	return fmt.Sprintf("Unknown struct field '%s' in '%s'", err.FieldName, err.StructName)
+}