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expected_two_map_type_arguments

Map literals require two type arguments or none, but {0} found.

Description

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The analyzer produces this diagnostic when a map literal has either one or more than two type arguments.

Example

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The following code produces this diagnostic because the map literal has three type arguments when it can have either two or zero:

dart
var m = <int, String, int>{};

Common fixes

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Remove all except two of the type arguments:

dart
var m = <int, String>{};