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3 Commits

Author SHA1 Message Date
Bryan Garza
36febe1f4d Improve safe transmute error reporting 
This patch updates the error reporting when Safe Transmute is not
possible between 2 types by including the reason.

Also, fix some small bugs that occur when computing the `Answer` for
transmutability.
 2023-04-13 21:57:08 +00:00
Jack Wrenn
f46fffc276 safe transmute: use Assume struct to provide analysis options 
This was left as a TODO in #92268, and brings the trait more in
line with what was defined in MCP411.

`Assume::visibility` has been renamed to `Assume::safety`, as
library safety is what's actually being assumed; visibility is
just the mechanism by which it is currently checked (this may
change).

ref: https://github.com/rust-lang/compiler-team/issues/411
ref: https://github.com/rust-lang/rust/issues/99571
 2022-08-22 18:37:54 +00:00
Jack Wrenn
bc4a1dea41 Initial (incomplete) implementation of transmutability trait. 
This initial implementation handles transmutations between types with specified layouts, except when references are involved.

Co-authored-by: Igor null <m1el.2027@gmail.com>
 2022-07-27 17:33:56 +00:00