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expected_one_list_type_arguments

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

Description

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

Example

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

dart
var l = <int, int>[];

Common fixes

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Remove all except one of the type arguments:

dart
var l = <int>[];