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|
// run-pass
// Tests that match expression handles overlapped literal and range
// properly in the presence of guard function.
fn val() -> usize { 1 }
static CONST: usize = 1;
pub fn main() {
lit_shadow_range();
range_shadow_lit();
range_shadow_range();
multi_pats_shadow_lit();
multi_pats_shadow_range();
lit_shadow_multi_pats();
range_shadow_multi_pats();
misc();
}
fn lit_shadow_range() {
assert_eq!(2, match 1 {
1 if false => 1,
1..=2 => 2,
_ => 3
});
let x = 0;
assert_eq!(2, match x+1 {
0 => 0,
1 if false => 1,
1..=2 => 2,
_ => 3
});
assert_eq!(2, match val() {
1 if false => 1,
1..=2 => 2,
_ => 3
});
assert_eq!(2, match CONST {
0 => 0,
1 if false => 1,
1..=2 => 2,
_ => 3
});
// value is out of the range of second arm, should match wildcard pattern
assert_eq!(3, match 3 {
1 if false => 1,
1..=2 => 2,
_ => 3
});
}
fn range_shadow_lit() {
assert_eq!(2, match 1 {
1..=2 if false => 1,
1 => 2,
_ => 3
});
let x = 0;
assert_eq!(2, match x+1 {
0 => 0,
1..=2 if false => 1,
1 => 2,
_ => 3
});
assert_eq!(2, match val() {
1..=2 if false => 1,
1 => 2,
_ => 3
});
assert_eq!(2, match CONST {
0 => 0,
1..=2 if false => 1,
1 => 2,
_ => 3
});
// ditto
assert_eq!(3, match 3 {
1..=2 if false => 1,
1 => 2,
_ => 3
});
}
fn range_shadow_range() {
assert_eq!(2, match 1 {
0..=2 if false => 1,
1..=3 => 2,
_ => 3,
});
let x = 0;
assert_eq!(2, match x+1 {
100 => 0,
0..=2 if false => 1,
1..=3 => 2,
_ => 3,
});
assert_eq!(2, match val() {
0..=2 if false => 1,
1..=3 => 2,
_ => 3,
});
assert_eq!(2, match CONST {
100 => 0,
0..=2 if false => 1,
1..=3 => 2,
_ => 3,
});
// ditto
assert_eq!(3, match 5 {
0..=2 if false => 1,
1..=3 => 2,
_ => 3,
});
}
fn multi_pats_shadow_lit() {
assert_eq!(2, match 1 {
100 => 0,
0 | 1..=10 if false => 1,
1 => 2,
_ => 3,
});
}
fn multi_pats_shadow_range() {
assert_eq!(2, match 1 {
100 => 0,
0 | 1..=10 if false => 1,
1..=3 => 2,
_ => 3,
});
}
fn lit_shadow_multi_pats() {
assert_eq!(2, match 1 {
100 => 0,
1 if false => 1,
0 | 1..=10 => 2,
_ => 3,
});
}
fn range_shadow_multi_pats() {
assert_eq!(2, match 1 {
100 => 0,
1..=3 if false => 1,
0 | 1..=10 => 2,
_ => 3,
});
}
fn misc() {
enum Foo {
Bar(#[allow(unused_tuple_struct_fields)] usize, bool)
}
// This test basically mimics how trace_macros! macro is implemented,
// which is a rare combination of vector patterns, multiple wild-card
// patterns and guard functions.
let r = match [Foo::Bar(0, false)] {
[Foo::Bar(_, pred)] if pred => 1,
[Foo::Bar(_, pred)] if !pred => 2,
_ => 0,
};
assert_eq!(2, r);
}
|
