New no_leading_understore_in_function_variables

[moneer-muntazah]

I'm not sure if this is already included, but I couldn't find it anywhere.

The dart underscore for private members makes it easy to tell that a construct is private just by looking at its name, but I noticed that sometimes it's misused. and variable names in functions are decaled with a leading underscore. I see no value of doing so since the variable scope is already confined to the function or statement it's declared in.

for instance

void foo() {
 int _answer = 42;
}

I would like a lint rule to discourage this behavior.

Thank you

[srawlins]

#58003

[moneer-muntazah]

I will close it for being repetitive.