Implement TrustedLen for Fuse<I: TrustedLen>

[sdroege]

This looks like it was simply forgotten.

[rust-highfive]

r? @kennytm

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[rust-log-analyzer]

The job x86_64-gnu-llvm-9 failed! Check out the build log: (web) (plain)

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   Compiling libc v0.2.79
   Compiling std v0.0.0 (/checkout/library/std)
   Compiling compiler_builtins v0.1.39
   Compiling unwind v0.0.0 (/checkout/library/unwind)
error[E0405]: cannot find trait `TrustedLen` in this scope
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186 | unsafe impl<I> TrustedLen for Fuse<I> where I: TrustedLen {}
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help: consider importing this trait
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1   | use crate::iter::TrustedLen;
1   | use crate::iter::TrustedLen;
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error[E0405]: cannot find trait `TrustedLen` in this scope
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186 | unsafe impl<I> TrustedLen for Fuse<I> where I: TrustedLen {}
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help: consider importing this trait
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1   | use crate::iter::TrustedLen;
1   | use crate::iter::TrustedLen;
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error: an `#[unstable]` annotation here has no effect
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185 | #[unstable(feature = "trusted_len", issue = "37572")]
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    = note: `#[deny(rustc::ineffective_unstable_trait_impl)]` on by default

error: aborting due to 3 previous errors

For more information about this error, try `rustc --explain E0405`.

[rust-log-analyzer]

The job mingw-check failed! Check out the build log: (web) (plain)

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configure: rust.channel         := nightly
configure: rust.debug-assertions := True
configure: llvm.assertions      := True
configure: dist.missing-tools   := True
configure: build.configure-args := ['--enable-sccache', '--disable-manage-submodu ...
configure: writing `config.toml` in current directory
configure: 
configure: run `python /checkout/x.py --help`
configure: 
---
skip untracked path cpu-usage.csv during rustfmt invocations
skip untracked path src/doc/book/ during rustfmt invocations
skip untracked path src/doc/rust-by-example/ during rustfmt invocations
skip untracked path src/llvm-project/ during rustfmt invocations
Diff in /checkout/library/core/src/iter/adapters/fuse.rs at line 1:
 use crate::intrinsics;
 use crate::iter::adapters::{zip::try_get_unchecked, InPlaceIterable, SourceIter};
-use crate::iter::{DoubleEndedIterator, ExactSizeIterator, FusedIterator, TrustedLen, TrustedRandomAccess};
+use crate::iter::{
+    DoubleEndedIterator, ExactSizeIterator, FusedIterator, TrustedLen, TrustedRandomAccess,
 use crate::ops::Try;
 
 
 /// An iterator that yields `None` forever after the underlying iterator
Running `"/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/rustfmt" "--config-path" "/checkout" "--edition" "2018" "--unstable-features" "--skip-children" "--check" "/checkout/library/core/src/iter/adapters/fuse.rs"` failed.
If you're running `tidy`, try again with `--bless`. Or, if you just want to format code, run `./x.py fmt` instead.
Build completed unsuccessfully in 0:00:18

[m-ou-se]

@bors r+ rollup

[bors]

📌 Commit 12b605a has been approved by m-ou-se