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equal_elements_in_const_set

Two elements in a constant set literal can't be equal.

Description

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The analyzer produces this diagnostic when two elements in a constant set literal have the same value. The set can only contain each value once, which means that one of the values is unnecessary.

Example

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The following code produces this diagnostic because the string 'a' is specified twice:

dart
const Set<String> set = {'a', 'a'};

Common fixes

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Remove one of the duplicate values:

dart
const Set<String> set = {'a'};

Note that literal sets preserve the order of their elements, so the choice of which element to remove might affect the order in which elements are returned by an iterator.