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a1dfa0c6 1error[E0080]: it is undefined behavior to use this value
f035d41b 2 --> $DIR/ub-upvars.rs:5:1
0bf4aa26 3 |
dc9dc135 4LL | / const BAD_UPVAR: &dyn FnOnce() = &{
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5LL | | let bad_ref: &'static u16 = unsafe { mem::transmute(0usize) };
6LL | | let another_var = 13;
7LL | | move || { let _ = bad_ref; let _ = another_var; }
8LL | | };
74b04a01 9 | |__^ type validation failed: encountered a NULL reference at .<deref>.<dyn-downcast>.<captured-var(bad_ref)>
0bf4aa26 10 |
e1599b0c 11 = note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
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13error: aborting due to previous error
14
15For more information about this error, try `rustc --explain E0080`.