Rename Iterator::len to count

This commit carries out the request from issue #14678:

> The method `Iterator::len()` is surprising, as all the other uses of
> `len()` do not consume the value. `len()` would make more sense to be
> called `count()`, but that would collide with the current
> `Iterator::count(|T| -> bool) -> unit` method. That method, however, is
> a bit redundant, and can be easily replaced with
> `iter.filter(|x| x < 5).count()`.
> After this change, we could then define the `len()` method
> on `iter::ExactSize`.

Closes #14678.

[breaking-change]

1 files changed, 1 insertions, 1 deletions

diff --git a/src/compiletest/runtest.rs b/src/compiletest/runtest.rs
index 10428244b71..8da984a414b 100644
--- a/src/compiletest/runtest.rs
+++ b/src/compiletest/runtest.rs
@@ -1545,7 +1545,7 @@ fn disassemble_extract(config: &Config, _props: &TestProps,
 fn count_extracted_lines(p: &Path) -> uint {
     let x = File::open(&p.with_extension("ll")).read_to_end().unwrap();
     let x = str::from_utf8(x.as_slice()).unwrap();
-    x.lines().len()
+    x.lines().count()
 }