borrowck: Prevent partial reinitialization of uninitialized structures #22219
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enumerations that implement the `Drop` trait.
This breaks code like:
struct Struct {
f: String,
g: String,
}
impl Drop for Struct { ... }
fn main() {
let x = Struct { ... };
drop(x);
x.f = ...;
}
Change this code to not create partially-initialized structures. For
example:
struct Struct {
f: String,
g: String,
}
impl Drop for Struct { ... }
fn main() {
let x = Struct { ... };
drop(x);
x = Struct {
f: ...,
g: ...,
}
}
Closes rust-lang#18571.
[breaking-change]
----
(Joint authorship by pcwalton and Ryman; thanks all!)
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borrowck: Prevent partial reinitialization of uninitialized structures
This is a pnkfelix-swiped squash of #22079, which was a rebase and revision of #18963
Fixes #18571.