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disallowed_type_instantiation_expression

Contents

Only a generic type, generic function, generic instance method, or generic constructor can have type arguments.

Description

#

The analyzer produces this diagnostic when an expression with a value that is anything other than one of the allowed kinds of values is followed by type arguments. The allowed kinds of values are:

  • generic types,
  • generic constructors, and
  • generic functions, including top-level functions, static and instance members, and local functions.

Example

#

The following code produces this diagnostic because i is a top-level variable, which isn't one of the allowed cases:

dart
int i = 1;

void f() {
  print(i<int>);
}

Common fixes

#

If the referenced value is correct, then remove the type arguments:

dart
int i = 1;

void f() {
  print(i);
}

Unless stated otherwise, the documentation on this site reflects Dart 3.8.0. Page last updated on 2025-05-08. View source or report an issue.