Macro stdcli::btreeset
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macro_rules! btreeset { ( $ ( $ key : expr , ) + ) => { ... }; ( $ ( $ key : expr ) , * ) => { ... }; }
Create a BTreeSet from a list of elements.
Example
#[macro_use] extern crate maplit; let set = btreeset!{"a", "b"}; assert!(set.contains("a")); assert!(set.contains("b")); assert!(!set.contains("c"));