Closed
Description
openedon Jun 10, 2022
Given the following code: https://play.rust-lang.org/?version=nightly&mode=debug&edition=2021&gist=d0d96c280bcde85e4d524178fefca741
let pkg;
if true {
pkg = 1;
} else {
// I forgot to initialize pkg!
}
drop(pkg);The current output is:
error[[E0381]](https://doc.rust-lang.org/stable/error-index.html#E0381): use of possibly-uninitialized variable: `pkg`
--> src/main.rs:8:10
|
8 | drop(pkg);
| ^^^ use of possibly-uninitialized `pkg`
Ideally the output should look like:
error[[E0381]](https://doc.rust-lang.org/stable/error-index.html#E0381): use of possibly-uninitialized variable: `pkg`
--> src/main.rs:8:10
|
8 | drop(pkg);
| ^^^ use of possibly-uninitialized `pkg`
|
| hint: the value is not assigned in the branch starting on src/main.rs:5:
|
5 | } else {
|
Because it can be difficult to figure out exactly which branch is failing to initialize a value, especially if it's not as simple as one if as above. For example, there may be a whole tree of conditionals between the let and the use, where only one sub-branch fails to initialize the variable, but spotting that amidst all the code isn't easy.
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