mirror of https://github.com/rust-lang/rust
40 lines
1.1 KiB
Rust
40 lines
1.1 KiB
Rust
//@ run-pass
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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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use std::ffi::c_int;
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#[link(name = "rust_test_helpers", kind = "static")]
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extern "C" {
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static mut rust_dbg_static_mut: c_int;
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pub fn rust_dbg_static_mut_check_four();
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}
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unsafe fn static_bound(_: &'static c_int) {}
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fn static_bound_set(a: &'static mut c_int) {
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*a = 3;
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}
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unsafe fn run() {
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assert_eq!(rust_dbg_static_mut, 3);
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rust_dbg_static_mut = 4;
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assert_eq!(rust_dbg_static_mut, 4);
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rust_dbg_static_mut_check_four();
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rust_dbg_static_mut += 1;
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assert_eq!(rust_dbg_static_mut, 5);
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rust_dbg_static_mut *= 3;
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assert_eq!(rust_dbg_static_mut, 15);
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rust_dbg_static_mut = -3;
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assert_eq!(rust_dbg_static_mut, -3);
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static_bound(&rust_dbg_static_mut);
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//~^ WARN shared reference to mutable static is discouraged [static_mut_refs]
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static_bound_set(&mut rust_dbg_static_mut);
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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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