Auto merge of #33214 - oli-obk:const_err_var_exprs, r=eddyb

report `const_err` on all expressions that can fail

also a drive-by fix for reporting an "overflow in shift *left*" when shifting an `i64` *right*

This increases the warning noise for shifting by more than the bitwidth and for `-T::MIN`. I can silence the bitwidth warnings explicitly and fix the const evaluator to make sure `--$expr` is treated exactly like `$expr` (which is kinda wrong, but mathematically right).

r? @eddyb

0 files changed, 0 insertions, 0 deletions