<@U3RE3RVLJ> These parameter names can be used by ...

# announcements

[ilya.gorbunov]

@ziggy42 These parameter names can be used by IDEA when it performs the function usage completion with the lambda parameter. When parameter name isn't specified it is produced from the type name. Usually S and T represent the same type, therefore to reduce confusion which of them is accumulator we name it with acc.