error: expressions must be enclosed in braces to be used as const generic arguments --> $DIR/const-expression-parameter.rs:10:20 | LL | i32_identity::<1 + 2>(); | ^^^^^ | help: enclose the `const` expression in braces | LL | i32_identity::<{ 1 + 2 }>(); | + + error: aborting due to 1 previous error