error[E0282]: type annotations needed --> $DIR/issue-6458-3.rs:4:5 | LL | mem::transmute(0); | ^^^^^^^^^^^^^^ cannot infer type of the type parameter `Dst` declared on the function `transmute` | help: consider specifying the generic arguments | LL | mem::transmute::(0); | ++++++++++++ error: aborting due to previous error For more information about this error, try `rustc --explain E0282`.