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Make all new types have UpperCamelCase names in code example in the Aliasing section #1528

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Apr 6, 2022
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Make all new types have UpperCamelCase names in code example in the Aliasing section #1528

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14 changes: 5 additions & 9 deletions src/types/alias.md
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Expand Up @@ -5,19 +5,15 @@ must have `UpperCamelCase` names, or the compiler will raise a warning. The
exception to this rule are the primitive types: `usize`, `f32`, etc.

```rust,editable
// `NanoSecond` is a new name for `u64`.
// `NanoSecond`, `Inch`, and `U64` are new names for `u64`.
type NanoSecond = u64;
type Inch = u64;

// Use an attribute to silence warning.
#[allow(non_camel_case_types)]
type u64_t = u64;
// TODO ^ Try removing the attribute
type U64 = u64;

fn main() {
// `NanoSecond` = `Inch` = `u64_t` = `u64`.
let nanoseconds: NanoSecond = 5 as u64_t;
let inches: Inch = 2 as u64_t;
// `NanoSecond` = `Inch` = `U64` = `u64`.
let nanoseconds: NanoSecond = 5 as U64;
let inches: Inch = 2 as U64;

// Note that type aliases *don't* provide any extra type safety, because
// aliases are *not* new types
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