unnecessary_underscores
Unnecessary use of multiple underscores.
Description
#The analyzer produces this diagnostic when an unused variable is named
with multiple underscores (for example __). A single _ wildcard variable
can be used instead.
Example
#The following code produces this diagnostic because the __ parameter is unused:
dart
void function(int __) { }Common fixes
#Replace the name with a single underscore:
dart
void function(int _) { }