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41 lines
1.0 KiB
Rust
41 lines
1.0 KiB
Rust
//@ run-pass
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#![allow(non_upper_case_globals)]
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// Constants (static variables) can be used to match in patterns, but mutable
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// statics cannot. This ensures that there's some form of error if this is
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// attempted.
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//@ aux-build:static_mut_xc.rs
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extern crate static_mut_xc;
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unsafe fn static_bound(_: &'static isize) {}
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fn static_bound_set(a: &'static mut isize) {
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*a = 3;
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}
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unsafe fn run() {
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assert_eq!(static_mut_xc::a, 3);
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static_mut_xc::a = 4;
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assert_eq!(static_mut_xc::a, 4);
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static_mut_xc::a += 1;
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assert_eq!(static_mut_xc::a, 5);
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static_mut_xc::a *= 3;
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assert_eq!(static_mut_xc::a, 15);
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static_mut_xc::a = -3;
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assert_eq!(static_mut_xc::a, -3);
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static_bound(&static_mut_xc::a);
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//~^ WARN shared reference to mutable static is discouraged [static_mut_refs]
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static_bound_set(&mut static_mut_xc::a);
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//~^ WARN mutable reference to mutable static is discouraged [static_mut_refs]
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}
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pub fn main() {
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unsafe { run() }
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}
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pub mod inner {
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pub static mut a: isize = 4;
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}
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