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Auto merge of #34357 - tbu-:pr_exact_size_is_empty, r=brson

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Add `is_empty` function to `ExactSizeIterator`

All other types implementing a `len` functions have `is_empty` already.
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bors 2016-07-18 14:26:22 -07:00 • committed by GitHub
commit bbfcb471db
2 changed files with 32 additions and 5 deletions
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7
src/test/compile-fail/method-suggestion-no-duplication.rs
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@ -18,7 +18,8 @@ fn foo<F>(f: F) where F: FnMut(Foo) {}
fn main() {
foo(|s| s.is_empty());
//~^ ERROR no method named `is_empty` found
//~^^ HELP #1: `core::slice::SliceExt`
//~^^^ HELP #2: `core::str::StrExt`
//~^^^^ HELP items from traits can only be used if the trait is implemented and in scope; the following traits define an item `is_empty`, perhaps you need to implement one of them:
//~^^ HELP #1: `std::iter::ExactSizeIterator`
//~^^^ HELP #2: `core::slice::SliceExt`
//~^^^^ HELP #3: `core::str::StrExt`
//~^^^^^ HELP items from traits can only be used if the trait is implemented and in scope; the following traits define an item `is_empty`, perhaps you need to implement one of them:
}