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add fallback body to box_new intrinsic #143432

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add fallback body to box_new intrinsic #143432

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4 changes: 3 additions & 1 deletion library/alloc/src/boxed.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -239,7 +239,9 @@ pub struct Box<
/// This is the surface syntax for `box <expr>` expressions.
#[rustc_intrinsic]
#[unstable(feature = "liballoc_internals", issue = "none")]
pub fn box_new<T>(x: T) -> Box<T>;
pub fn box_new<T>(x: T) -> Box<T> {
Box::write(Box::new_uninit(), x)
}

impl<T> Box<T> {
/// Allocates memory on the heap and then places `x` into it.
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