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expected_one_set_type_arguments

Set literals require one type argument or none, but {0} were found.

Description

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The analyzer produces this diagnostic when a set literal has more than one type argument.

Example

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The following code produces this diagnostic because the set literal has three type arguments when it can have at most one:

dart
var s = <int, String, int>{0, 'a', 1};

Common fixes

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Remove all except one of the type arguments:

dart
var s = <int>{0, 1};