main_is_not_function

The declaration named 'main' must be a function.

The analyzer produces this diagnostic when a library contains a declaration of the name main that isn't the declaration of a top-level function.

The following code produces this diagnostic because the name main is being used to declare a top-level variable:

var main = 3;

Use a different name for the declaration:

var mainIndex = 3;

Unless stated otherwise, the documentation on this site reflects Dart 3.8.0. Page last updated on 2025-05-08. View source or report an issue.