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non_type_as_type_argument

The name '{0}' isn't a type, so it can't be used as a type argument.

Description

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The analyzer produces this diagnostic when an identifier that isn't a type is used as a type argument.

Example

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The following code produces this diagnostic because x is a variable, not a type:

dart
var x = 0;
List<x> xList = [];

Common fixes

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Change the type argument to be a type:

dart
var x = 0;
List<int> xList = [];