loops not allowed in constants. #62272Description
Technically a regression from 1.24 to 1.25, but I don't think anyone used this.
Example code which used to be allowed:
pub const FOO: () = loop { break; };I'm pretty sure this changed with #47802, which added the FalseUnwind terminator to MIR, but didn't handle it in const-checking (which otherwise ignores cleanup blocks).