Location now stores width instead of Error

file/error.go

@@ -12,7 +12,6 @@ const (
 
 type Error struct {
 	Location
-	width   int
 	message string
 	kind    ErrorKind
 }
@@ -20,7 +19,6 @@ type Error struct {
 // NewError creates a new error at the specified location.
 func NewError (
 	location Location,
-	width int,
 	message string,
 	kind ErrorKind,
 ) (
@@ -28,7 +26,6 @@ func NewError (
 ) {
 	return &Error {
 		Location: location,
-		width:    width,
 		message:  message,
 		kind:     kind,
 	}

file/file.go

@@ -108,5 +108,6 @@ func (file *File) Location () (location Location) {
 		file:   file,
 		row:    file.currentLine,
 		column: file.currentColumn,
+		width:  1,
 	}
 }

file/location.go

@@ -6,4 +6,5 @@ type Location struct {
 	file   *File
 	row    int
 	column int
+	width  int
 }