52 lines
1.4 KiB
Rust
52 lines
1.4 KiB
Rust
// this tests move up progration, which is not yet implemented
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// Check codegen for assignments (`a = b`) where the left-hand-side is
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// not yet initialized. Assignments tend to be absent in simple code,
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// so subtle breakage in them can leave a quite hard-to-find trail of
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// destruction.
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fn main() {
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let nodrop_x = false;
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let nodrop_y;
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// Since boolean does not require drop, this can be a simple
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// assignment:
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nodrop_y = nodrop_x;
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let drop_x : Option<Box<u32>> = None;
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let drop_y;
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// Since the type of `drop_y` has drop, we generate a `replace`
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// terminator:
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drop_y = drop_x;
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}
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// END RUST SOURCE
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// START rustc.main.SimplifyCfg-initial.after.mir
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// bb0: {
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// StorageLive(_1);
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// _1 = const false;
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// FakeRead(ForLet, _1);
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// StorageLive(_2);
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// StorageLive(_3);
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// _3 = _1;
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// _2 = move _3;
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// StorageDead(_3);
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// StorageLive(_4);
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// _4 = std::option::Option::<std::boxed::Box<u32>>::None;
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// FakeRead(ForLet, _4);
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// AscribeUserType(_4, o, UserTypeProjection { base: UserType(1), projs: [] });
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// StorageLive(_5);
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// StorageLive(_6);
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// _6 = move _4;
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// replace(_5 <- move _6) -> [return: bb2, unwind: bb5];
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// }
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// ...
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// bb2: {
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// drop(_6) -> [return: bb6, unwind: bb4];
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// }
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// ...
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// bb5 (cleanup): {
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// drop(_6) -> bb4;
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// }
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// END rustc.main.SimplifyCfg-initial.after.mir
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