[Bug 1920018] Re: inconsistent file list / missing libcore

[Simon Chopin]

In the current version (and probably back in 1.57) you'll find the
libcore sources at /usr/src/rustc-$VERSION/library/core which would
explain why paelzer's grep failed (no "libcore" in the path).

Marking this as "Fix released" since we have both consistency and the
libcore sources :)

** Changed in: rustc (Ubuntu)
       Status: Confirmed => Fix Released

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Title:
  inconsistent file list / missing libcore

Status in rustc package in Ubuntu:
  Fix Released

Bug description:
  In packages.ubuntu.com, for focal 20.04 release.
  https://packages.ubuntu.com/focal/all/rust-src/filelist

  reading through the list of installed files, it looks the package 
  ``1.47.0+dfsg1+llvm-1ubuntu1~20.04.1``
   is installing source files for rustc version 1.41.

  . After installing the package via apt-get
  $ sudo apt-get install rust-src

  I get different answers from the following commands

  from ``apt-file list``

  ```
  $ apt-file list rust-src | grep libcore
  [...]
  rust-src: /usr/src/rustc-1.41.0/src/libcore/alloc.rs
  rust-src: /usr/src/rustc-1.41.0/src/libcore/any.rs
  rust-src: /usr/src/rustc-1.41.0/src/libcore/array/iter.rs
  rust-src: /usr/src/rustc-1.41.0/src/libcore/array/mod.rs
  rust-src: /usr/src/rustc-1.41.0/src/libcore/ascii.rs
  rust-src: /usr/src/rustc-1.41.0/src/libcore/benches/any.rs
  rust-src: /usr/src/rustc-1.41.0/src/libcore/benches/ascii.rs
  [...]
  ```
  ( I am cutting out a long list of files in the libcore subfolder)

  while with dpkg
  ```
  $ dpkg -L rust-src | grep libcore 
  /usr/src/rustc-1.47.0/src/doc/edition-guide/src/rust-2018/platform-and-target-support/libcore-for-low-level-rust.md
  /usr/src/rustc-1.47.0/src/etc/natvis/libcore.natvis
  /usr/src/rustc-1.47.0/src/test/ui/consts/const-eval/const_panic_libcore.rs
  /usr/src/rustc-1.47.0/src/test/ui/consts/const-eval/const_panic_libcore.stderr
  /usr/src/rustc-1.47.0/src/test/ui/consts/const-eval/const_panic_libcore_main.rs
  /usr/src/rustc-1.47.0/src/test/ui/consts/const-eval/const_panic_libcore_main.stderr
  /usr/src/rustc-1.47.0/src/test/ui/consts/unstable-const-fn-in-libcore.rs
  /usr/src/rustc-1.47.0/src/test/ui/consts/unstable-const-fn-in-libcore.stderr
  /usr/src/rustc-1.47.0/src/test/ui/threads-sendsync/sync-send-iterators-in-libcore.rs
  /usr/src/rustc-1.47.0/src/test/ui/variance-iterators-in-libcore.rs

  ```
  no trace of any libcore subfolder

  to prove ``dpkg`` is the one telling the truth
  ```
  $ ls /usr/src/ -1
  linux-headers-5.4.0-66
  linux-headers-5.4.0-66-generic
  linux-headers-5.4.0-67
  linux-headers-5.4.0-67-generic
  rustc-1.47.0
  ```
  no trace of any ``rustc-1.41`` folder

  also:
  ```
  $ dpkg-deb -c /var/cache/apt/archives/rust-src_1.47.0+dfsg1+llvm-1ubuntu1~20.04.1_all.deb | grep libcore
  -rw-r--r-- root/root      1079 2020-10-07 10:04 ./usr/src/rustc-1.47.0/src/doc/edition-guide/src/rust-2018/platform-and-target-support/libcore-for-low-level-rust.md
  -rw-r--r-- root/root      1607 2020-10-07 09:53 ./usr/src/rustc-1.47.0/src/etc/natvis/libcore.natvis
  -rw-r--r-- root/root       315 2020-10-07 09:53 ./usr/src/rustc-1.47.0/src/test/ui/consts/const-eval/const_panic_libcore.rs
  -rw-r--r-- root/root      1320 2020-10-07 09:53 ./usr/src/rustc-1.47.0/src/test/ui/consts/const-eval/const_panic_libcore.stderr
  -rw-r--r-- root/root       486 2020-10-07 09:53 ./usr/src/rustc-1.47.0/src/test/ui/consts/const-eval/const_panic_libcore_main.rs
  -rw-r--r-- root/root      1352 2020-10-07 09:53 ./usr/src/rustc-1.47.0/src/test/ui/consts/const-eval/const_panic_libcore_main.stderr
  -rw-r--r-- root/root       839 2020-10-07 09:53 ./usr/src/rustc-1.47.0/src/test/ui/consts/unstable-const-fn-in-libcore.rs
  -rw-r--r-- root/root      1075 2020-10-07 09:53 ./usr/src/rustc-1.47.0/src/test/ui/consts/unstable-const-fn-in-libcore.stderr
  -rw-r--r-- root/root      2578 2020-10-07 09:53 ./usr/src/rustc-1.47.0/src/test/ui/threads-sendsync/sync-send-iterators-in-libcore.rs
  -rw-r--r-- root/root       244 2020-10-07 09:53 ./usr/src/rustc-1.47.0/src/test/ui/variance-iterators-in-libcore.rs

  ```

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