"expected struct `std::boxed::Box`, found struct `std::string::String`", scan-rules 0.2.0, Rust 1.17 nightly #39826

brson opened this Issue Feb 14, 2017 · 1 comment


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brson commented Feb 14, 2017
brian@ip-10-145-43-250:~/dev/rust-scan-rules⟫ git remote -v
origin  https://github.com/DanielKeep/rust-scan-rules (fetch)
origin  https://github.com/DanielKeep/rust-scan-rules (push)
brian@ip-10-145-43-250:~/dev/rust-scan-rules⟫ git log -1
commit 151b4d822c33dcb8a04d9fa55d1084c948e5b76d
Author: Daniel Keep <daniel.keep@gmail.com>
Date:   Mon Nov 7 16:27:19 2016 +1100

    chore: updated docs for release.
brian@ip-10-145-43-250:/mnt2/dev⟫ rustc +stable -Vv
rustc 1.15.1 (021bd294c 2017-02-08)
binary: rustc
commit-hash: 021bd294c039bd54aa5c4aa85bcdffb0d24bc892
commit-date: 2017-02-08
host: x86_64-unknown-linux-gnu
release: 1.15.1
LLVM version: 3.9
101 brian@ip-10-145-43-250:~/dev/rust-scan-rules⟫ cargo +nightly test
   Compiling bitflags v0.4.0
   Compiling semver v0.1.20
   Compiling unicode-segmentation v0.1.3
   Compiling lazy_static v0.1.16
   Compiling itertools v0.4.19
warning[E0122]: trait bounds are not (yet) enforced in type definitions
   --> /home/brian/.cargo/registry/src/github.com-1ecc6299db9ec823/itertools-0.4.19/src/lib.rs:123:1
123 | pub type MapFn<I, B> where I: Iterator = iter::Map<I, fn(I::Item) -> B>;
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

   Compiling rustc_version v0.1.7
   Compiling strcursor v0.2.3
   Compiling scan-rules v0.2.0 (file:///mnt2/dev/rust-scan-rules)
error[E0308]: mismatched types
   --> /home/brian/.cargo/registry/src/github.com-1ecc6299db9ec823/strcursor-0.2.3/src/grapheme.rs:525:15
525 |         GcBuf(s)
    |               ^ expected struct `std::boxed::Box`, found struct `std::string::String`
    = note: expected type `std::boxed::Box<str>`
               found type `std::string::String`
    = help: here are some functions which might fulfill your needs:
            - .into_boxed_str()

error: aborting due to previous error

error: Could not compile `strcursor`.

To learn more, run the command again with --verbose.

Not on 1.15. Different from 1.16 #39825

cc @DanielKeep

arielb1 commented Feb 16, 2017

libs team - does this look like XIB (expected inference breakage) to you?

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