Fix items resoution from prelude on the nightly Rust #4226
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Recently, a lot of items in nightly stdlib prelude (
libstd/prelude/v1.rs) were duplicate with differentcfgattributeBut we don't support cfg attributes or now (see #1191). That leads to multiple results while name resolution of these items and subsequent failure in name resolution because of multi resolve.
These changes add a temporary fix for correct name resolution for items from the prelude