+error[E0723]: can only call other `const fn` within a `const fn`, but `const std::ops::Add::add` is not stable as `const fn`
+ --> $DIR/const_let_refutable.rs:4:5
+ |
+LL | a + b
+ | ^^^^^
+ |
+ = note: for more information, see issue https://github.com/rust-lang/rust/issues/57563
+ = help: add #![feature(const_fn)] to the crate attributes to enable
+
+warning[E0381]: use of possibly uninitialized variable: `a`
+ --> $DIR/const_let_refutable.rs:4:5
+ |
+LL | a + b
+ | ^ use of possibly uninitialized `a`
+ |
+ = warning: this error has been downgraded to a warning for backwards compatibility with previous releases
+ = warning: this represents potential undefined behavior in your code and this warning will become a hard error in the future
+
+warning[E0381]: use of possibly uninitialized variable: `b`
+ --> $DIR/const_let_refutable.rs:4:9
+ |
+LL | a + b
+ | ^ use of possibly uninitialized `b`
+ |
+ = warning: this error has been downgraded to a warning for backwards compatibility with previous releases
+ = warning: this represents potential undefined behavior in your code and this warning will become a hard error in the future
+
+error: aborting due to 2 previous errors