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main_is_not_function

The declaration named 'main' must be a function.

Description

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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.

Example

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

dart
var main = 3;

Common fixes

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Use a different name for the declaration:

dart
var mainIndex = 3;