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|
// check-fail
fn let_underscore(string: &Option<&str>, mut num: Option<i32>) {
let _ = if let Some(s) = *string { s.len() } else { 0 };
let _ = if let Some(s) = &num { s } else { &0 };
let _ = if let Some(s) = &mut num {
*s += 1;
s
} else {
&mut 0
//~^ ERROR temporary value dropped while borrowed
};
let _ = if let Some(ref s) = num { s } else { &0 };
let _ = if let Some(mut s) = num {
s += 1;
s
} else {
0
};
let _ = if let Some(ref mut s) = num {
*s += 1;
s
} else {
&mut 0
//~^ ERROR temporary value dropped while borrowed
};
}
fn let_ascribe(string: &Option<&str>, mut num: Option<i32>) {
let _: _ = if let Some(s) = *string { s.len() } else { 0 };
let _: _ = if let Some(s) = &num { s } else { &0 };
let _: _ = if let Some(s) = &mut num {
*s += 1;
s
} else {
&mut 0
//~^ ERROR temporary value dropped while borrowed
};
let _: _ = if let Some(ref s) = num { s } else { &0 };
let _: _ = if let Some(mut s) = num {
s += 1;
s
} else {
0
};
let _: _ = if let Some(ref mut s) = num {
*s += 1;
s
} else {
&mut 0
//~^ ERROR temporary value dropped while borrowed
};
}
fn matched(string: &Option<&str>, mut num: Option<i32>) {
match if let Some(s) = *string { s.len() } else { 0 } {
_ => {}
};
match if let Some(s) = &num { s } else { &0 } {
_ => {}
};
match if let Some(s) = &mut num {
*s += 1;
s
} else {
&mut 0
//~^ ERROR temporary value dropped while borrowed
} {
_ => {}
};
match if let Some(ref s) = num { s } else { &0 } {
_ => {}
};
match if let Some(mut s) = num {
s += 1;
s
} else {
0
} {
_ => {}
};
match if let Some(ref mut s) = num {
*s += 1;
s
} else {
&mut 0
//~^ ERROR temporary value dropped while borrowed
} {
_ => {}
};
}
fn main() {}
|
