duplicate_ definition
The name '{0}' is already defined.
Description
#The analyzer produces this diagnostic when a name is declared, and there is a previous declaration with the same name in the same scope.
Example
#
The following code produces this diagnostic because the name
x
is
declared twice:
int x = 0;
int x = 1;
Common fixes
#Choose a different name for one of the declarations.
int x = 0;
int y = 1;
Unless stated otherwise, the documentation on this site reflects Dart 3.9.2. Page last updated on 2025-9-1. View source or report an issue.