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error[E0425]: cannot find value `err` in this scope
--> $DIR/issue-103909.rs:5:12
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LL | if Err(err) = File::open("hello.txt") {
| ^^^ not found in this scope
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help: you might have meant to use pattern matching
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LL | if let Err(err) = File::open("hello.txt") {
| +++
error[E0308]: mismatched types
--> $DIR/issue-103909.rs:5:8
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LL | if Err(err) = File::open("hello.txt") {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `bool`, found `()`
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help: consider adding `let`
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LL | if let Err(err) = File::open("hello.txt") {
| +++
error: aborting due to 2 previous errors
Some errors have detailed explanations: E0308, E0425.
For more information about an error, try `rustc --explain E0308`.
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