Andrew Kelley d8540dd708 std: add type-erased reader; base GenericReader on it
The idea here is to avoid code bloat by having only one actual io.Reader
implementation, which is type erased, and then implement a GenericReader
that preserves type information on top of that as thin glue code.

The strategy here is for that glue code to `@errSetCast` the result of
the type-erased reader functions, however, while trying to do that I
ran into #17343.
2023-10-03 14:55:17 -07:00
..