src/test/ui/borrowck/disallow-possibly-uninitialized.rs

// Test that we don't allow partial initialization.
// This may be relaxed in the future (see #54987).

fn main() {
    let mut t: (u64, u64);
    t.0 = 1;
    //~^ ERROR assign to part of possibly-uninitialized variable: `t` [E0381]
    t.1 = 1;

    let mut t: (u64, u64);
    t.1 = 1;
    //~^ ERROR assign to part of possibly-uninitialized variable: `t` [E0381]
    t.0 = 1;

    let mut t: (u64, u64);
    t.0 = 1;
    //~^ ERROR assign to part of possibly-uninitialized variable: `t` [E0381]

    let mut t: (u64,);
    t.0 = 1;
    //~^ ERROR assign to part of possibly-uninitialized variable: `t` [E0381]
}