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missing_required_argument

The named parameter '{0}' is required, but there's no corresponding argument.

Description

#

The analyzer produces this diagnostic when an invocation of a function is missing a required named parameter.

Example

#

The following code produces this diagnostic because the invocation of f doesn't include a value for the required named parameter end:

dart
void f(int start, {required int end}) {}
void g() {
  f(3);
}

Common fixes

#

Add a named argument corresponding to the missing required parameter:

dart
void f(int start, {required int end}) {}
void g() {
  f(3, end: 5);
}