[macros] Support shrinking reference transmutes #2487
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This was referenced Jun 9, 2025
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In `transmute_ref!` and `transmute_mut!`, support an `#![allow(shrink)]` attribute which is invoked as follows: transmute_ref!(#![allow(shrink)] src); When this attribute is provided, the macros will permit shrinking transmutes, in which the destination value may be smaller than the source value. Makes progress on #1817 Co-authored-by: Jack Wrenn <[email protected]> gherrit-pr-id: I10874e2bc703fb6b7fcdea050b8971de869a850a
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In
transmute_ref!andtransmute_mut!, support an#![allow(shrink)]attribute which is invoked as follows:
transmute_ref!(#![allow(shrink)] src);
When this attribute is provided, the macros will permit shrinking
transmutes, in which the destination value may be smaller than the
source value.
Makes progress on #1817
Co-authored-by: Jack Wrenn [email protected]
This PR is on branch transmute-ref-dst.