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error[E0381]: partially assigned binding `t` isn't fully initialized
  --> $DIR/issue-54499-field-mutation-of-never-init.rs:12:9
   |
LL |         let t: Tuple;
   |             - binding declared here but left uninitialized
LL |         t.0 = S(1);
   |         ^^^^^^^^^^ `t` partially assigned here but it isn't fully initialized
   |
   = help: partial initialization isn't supported, fully initialize the binding with a default value and mutate it, or use `std::mem::MaybeUninit`

error[E0381]: partially assigned binding `u` isn't fully initialized
  --> $DIR/issue-54499-field-mutation-of-never-init.rs:20:9
   |
LL |         let u: Tpair;
   |             - binding declared here but left uninitialized
LL |         u.0 = S(1);
   |         ^^^^^^^^^^ `u` partially assigned here but it isn't fully initialized
   |
   = help: partial initialization isn't supported, fully initialize the binding with a default value and mutate it, or use `std::mem::MaybeUninit`

error[E0381]: partially assigned binding `v` isn't fully initialized
  --> $DIR/issue-54499-field-mutation-of-never-init.rs:28:9
   |
LL |         let v: Spair;
   |             - binding declared here but left uninitialized
LL |         v.x = S(1);
   |         ^^^^^^^^^^ `v` partially assigned here but it isn't fully initialized
   |
   = help: partial initialization isn't supported, fully initialize the binding with a default value and mutate it, or use `std::mem::MaybeUninit`

error: aborting due to 3 previous errors

For more information about this error, try `rustc --explain E0381`.