mirror of https://github.com/rust-lang/rust
37 lines
753 B
Rust
37 lines
753 B
Rust
//@ run-pass
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//@ compile-flags: -Zunleash-the-miri-inside-of-you
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fn double(x: usize) -> usize { x * 2 }
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const fn double_const(x: usize) -> usize { x * 2 }
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const X: fn(usize) -> usize = double;
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const X_CONST: fn(usize) -> usize = double_const;
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const fn bar(x: usize) -> usize {
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X(x)
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}
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const fn bar_const(x: usize) -> usize {
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X_CONST(x)
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}
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const fn foo(x: fn(usize) -> usize, y: usize) -> usize {
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x(y)
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}
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fn main() {
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const Y: usize = bar_const(2);
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assert_eq!(Y, 4);
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let y = bar_const(2);
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assert_eq!(y, 4);
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let y = bar(2);
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assert_eq!(y, 4);
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const Z: usize = foo(double_const, 2);
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assert_eq!(Z, 4);
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let z = foo(double_const, 2);
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assert_eq!(z, 4);
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let z = foo(double, 2);
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assert_eq!(z, 4);
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}
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