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unnecessary_null_assert_pattern

The null-assert pattern will have no effect because the matched type isn't nullable.

Description

#

The analyzer produces this diagnostic when a null-assert pattern is used to match a value that isn't nullable.

Example

#

The following code produces this diagnostic because the variable x isn't nullable:

dart
void f(int x) {
  if (x case var a! when a > 0) {}
}

Common fixes

#

Remove the null-assert pattern:

dart
void f(int x) {
  if (x case var a when a > 0) {}
}