I find the error message confusing and possibly incorrect when attempting to use ~ as a unary operator:

In current Rust stable and nightly, I get:

error: `~` cannot be used as a unary operator --> src/main.rs:5:11 | 5 | num = ~num + 1; | ^ help: use `!` to perform bitwise negation 

The "help" is misleading because it is suggesting using ! to "perform bitwise negation." But this is not really what ~ performs. NEG and NOT are two separate instructions which perform different things. I think this message would be best changed to "perform bitwise NOT" or "perform bitwise one's complement"