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turbofish

The ::<Type> that names a type after a name, as in parse::().

The turbofish :: supplies generic type arguments at a call site, as in "42".parse::().

Examples

  • "2.5".parse::<f64>() names the target type with ::<f64>; let x: f64 = "2.5".parse().unwrap(); says the same through an annotation.

See also

type annotation type inference parse generics
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