Rollup merge of #55630 - petrochenkov:noprelude, r=Centril
resolve: Filter away macro prelude in modules with `#[no_implicit_prelude]` on 2018 edition This is a tiny thing. For historical reasons macro prelude (macros from `#[macro_use] extern crate ...`, including `extern crate std`) is still available in modules with `#[no_implicit_prelude]`. This PR provides proper isolation and removes those names from scope. `#[no_implicit_prelude]` modules still have built-in types (`u8`), built-in attributes (`#[inline]`) and built-in macros (`env!("PATH")`) in scope. We can introduce some `#[no_implicit_prelude_at_all]` to remove those as well, but that's a separate issue. The change is done only on 2018 edition for backward compatibility. I'm pretty sure this can be done on 2015 as well because `#[no_implicit_prelude]` is rarely used, but I don't want to go through the crater/deprecation process right now, maybe later. cc https://github.com/rust-lang/rust/issues/53977 r? @ghost
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