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Rollup of 9 pull requests #73387

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MikailBag and others added 20 commits May 27, 2020 00:57
This commit normalizes projections which contain opaque types (opaque types
are otherwise linted against, which is would have previously made the
test cases added in this commit fail).

Signed-off-by: David Wood <david@davidtw.co>
Enabling static-pie for musl

and make it the default for the x86_64-unknown-linux-musl target

This is a quick implementation for rust-lang#70693

Opening it as a draft PR to gather some feedback, before I put more work in it.

```console
❯ cat hello.rs
fn main() {
    println!("main = {:#x}", &main as *const _ as usize);
}

❯  /tmp/rust-musl/bin/rustc  --target x86_64-unknown-linux-musl  ~/hello.rs

❯ ldd hello
	statically linked

❯ file hello
hello: ELF 64-bit LSB shared object, x86-64, version 1 (GNU/Linux), statically linked, BuildID[sha1]=fec5cdc170f503a712a63a6958691ce5ce433654, with debug_info, not stripped

❯ ./hello
main = 0x7f233ca30008

❯ ./hello
main = 0x7f9ddc529008

❯ ./hello
main = 0x7f1e5a224008

❯ ./hello
main = 0x7f4485c7c008

❯ /tmp/rust-musl/bin/rustc  --target x86_64-unknown-linux-musl  -Z print-link-args  ~/hello.rs
"cc" "-Wl,--as-needed" "-Wl,-z,noexecstack" "-Wl,--eh-frame-hdr" "-m64" "-nostdlib" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib/rcrt1.o" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib/crti.o" "-L" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib" "hello.hello.7rcbfp3g-cgu.0.rcgu.o" "hello.hello.7rcbfp3g-cgu.1.rcgu.o" "hello.hello.7rcbfp3g-cgu.2.rcgu.o" "hello.hello.7rcbfp3g-cgu.3.rcgu.o" "hello.hello.7rcbfp3g-cgu.4.rcgu.o" "hello.hello.7rcbfp3g-cgu.5.rcgu.o" "-o" "hello" "hello.1nxjf9so94czdgcz.rcgu.o" "-Wl,--gc-sections" "-static-pie" "-Wl,-zrelro" "-Wl,-znow" "-nodefaultlibs" "-L" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib" "-Wl,--start-group" "-Wl,-Bstatic" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib/libstd-0f9cb7646f9e2c34.rlib" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib/libpanic_unwind-ba857f2f2e4e7187.rlib" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib/libhashbrown-58ba5e25bbdf9d29.rlib" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib/librustc_std_workspace_alloc-886bfe43afa847dc.rlib" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib/libbacktrace-fbfb8fe99f19a67b.rlib" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib/libbacktrace_sys-85fa859e7d364cc9.rlib" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib/librustc_demangle-07ab026cd3ec0d82.rlib" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib/libunwind-a8ec5932d92ea864.rlib" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib/libcfg_if-0ba4cc2f38a198d5.rlib" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib/liblibc-c1bb2b3ce4f78b7c.rlib" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib/liballoc-0ff673c1cf0d451a.rlib" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib/librustc_std_workspace_core-c8ff2001db856926.rlib" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib/libcore-2ae14177140eeca2.rlib" "-Wl,--end-group" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib/libcompiler_builtins-4fd81b5ce1b08a9c.rlib" "-static" "-Wl,-Bdynamic" "/tmp/rust-musl/lib/rustlib/x86_64-unknown-linux-musl/lib/crtn.o"
```
…epmaster

Add tests for 'impl Default for [T; N]'

Related: rust-lang#71690.
This pull request adds two tests:
- Even it T::default() panics, no leaks occur.
- [T; 0] is Default even if T is not.

I believe at some moment `Default` impl for arrays will be rewritten to use const generics instead of macros, and these tests will help to prevent behavior changes.
…ies, r=shepmaster

Complete the std::time documentation to warn about the inconsistencies between OS

Fix for rust-lang#48980.

I put the new documentation in `src/libstd/time.rs` at the module-level because it affects all types, even the one that are not directly system dependents if they are used with affected types, but there may be a better place for it.
Ensure std benchmarks get tested.

This ensures that the std benchmarks don't break in the future. Currently they aren't compiled or tested on CI, so they can easily bitrot.  Testing a benchmark runs it with one iteration. Adding these should only add a few seconds to CI.

Closes rust-lang#54176
Closes rust-lang#61913
…in-projections, r=estebank

lint: normalize projections using opaque types

Fixes rust-lang#73251.

This PR normalizes projections which use opaque types (opaque types are otherwise linted against, which is would have previously made the test cases added in this PR fail).
Don't run generator transform when there's a TyErr

Not sure if this might cause any problems later on, but we shouldn't be hitting codegen or const eval for the produced MIR anyways, so it should be fine.

cc rust-lang#72685 (comment)
…tions, r=kinnison

Re-order correctly the sections in the sidebar

Before that, "trait implementations" and "implementors" titles in the sidebar were before "methods" for example. Which wasn't logical considering that the two sections come after in the "content".

r? @kinnison
@Dylan-DPC-zz
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@bors r+ p=9 rollup=never

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bors commented Jun 15, 2020

📌 Commit ac97474 has been approved by Dylan-DPC

@bors bors added the S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. label Jun 15, 2020
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The job x86_64-gnu-llvm-8 of your PR failed (pretty log, raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.
##[section]Starting: Linux x86_64-gnu-llvm-8
##[section]Starting: Initialize job
Agent name: 'Azure Pipelines 61'
Agent machine name: 'fv-az578'
Current agent version: '2.170.1'
##[group]Operating System
16.04.6
LTS
LTS
##[endgroup]
##[group]Virtual Environment
Environment: ubuntu-16.04
Version: 20200604.1
Included Software: https://github.com/actions/virtual-environments/blob/ubuntu16/20200604.1/images/linux/Ubuntu1604-README.md
##[endgroup]
Agent running as: 'vsts'
Prepare build directory.
Set build variables.
Download all required tasks.
Download all required tasks.
Downloading task: Bash (3.163.3)
Checking job knob settings.
   Knob: AgentToolsDirectory = /opt/hostedtoolcache Source: ${AGENT_TOOLSDIRECTORY} 
   Knob: AgentPerflog = /home/vsts/perflog Source: ${VSTS_AGENT_PERFLOG} 
Start tracking orphan processes.
##[section]Finishing: Initialize job
##[section]Starting: Configure Job Name
==============================================================================
---
========================== Starting Command Output ===========================
[command]/bin/bash --noprofile --norc /home/vsts/work/_temp/71ca8692-88fd-49ac-82be-d339ab52ef6a.sh

##[section]Finishing: Disable git automatic line ending conversion
##[section]Starting: Checkout rust-lang/rust@refs/pull/73387/merge to s
Task         : Get sources
Description  : Get sources from a repository. Supports Git, TfsVC, and SVN repositories.
Version      : 1.0.0
Author       : Microsoft
---
##[command]git remote add origin https://github.com/rust-lang/rust
##[command]git config gc.auto 0
##[command]git config --get-all http.https://github.com/rust-lang/rust.extraheader
##[command]git config --get-all http.proxy
##[command]git -c http.extraheader="AUTHORIZATION: basic ***" fetch --force --tags --prune --progress --no-recurse-submodules --depth=2 origin +refs/heads/*:refs/remotes/origin/* +refs/pull/73387/merge:refs/remotes/pull/73387/merge
---
 ---> 29a56a071ad9
Step 5/8 : ENV RUST_CONFIGURE_ARGS       --build=x86_64-unknown-linux-gnu       --llvm-root=/usr/lib/llvm-8       --enable-llvm-link-shared       --set rust.thin-lto-import-instr-limit=10
 ---> Using cache
 ---> eb826cd6a4d7
Step 6/8 : ENV SCRIPT python2.7 ../x.py test --exclude src/tools/tidy &&            python2.7 ../x.py test src/test/mir-opt --pass=build                                   --target=armv5te-unknown-linux-gnueabi &&            python2.7 ../x.py test src/tools/tidy
 ---> 9841042138f8
Step 7/8 : ENV NO_DEBUG_ASSERTIONS=1
 ---> Using cache
 ---> 00b49f7048de
---
   Compiling rustc_parse_format v0.0.0 (/checkout/src/librustc_parse_format)
   Compiling chalk-rust-ir v0.10.0
   Compiling rustc_ast_pretty v0.0.0 (/checkout/src/librustc_ast_pretty)
   Compiling rustc_hir v0.0.0 (/checkout/src/librustc_hir)
   Compiling rustc_query_system v0.0.0 (/checkout/src/librustc_query_system)
   Compiling chalk-solve v0.10.0
   Compiling rustc_hir_pretty v0.0.0 (/checkout/src/librustc_hir_pretty)
   Compiling rustc_parse v0.0.0 (/checkout/src/librustc_parse)
   Compiling rustc_ast_lowering v0.0.0 (/checkout/src/librustc_ast_lowering)
---
   Compiling rustc_parse_format v0.0.0 (/checkout/src/librustc_parse_format)
   Compiling chalk-rust-ir v0.10.0
   Compiling rustc_ast_pretty v0.0.0 (/checkout/src/librustc_ast_pretty)
   Compiling rustc_hir v0.0.0 (/checkout/src/librustc_hir)
   Compiling rustc_query_system v0.0.0 (/checkout/src/librustc_query_system)
   Compiling chalk-solve v0.10.0
   Compiling rustc_hir_pretty v0.0.0 (/checkout/src/librustc_hir_pretty)
   Compiling rustc_parse v0.0.0 (/checkout/src/librustc_parse)
   Compiling rustc_ast_lowering v0.0.0 (/checkout/src/librustc_ast_lowering)
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---

---- [ui] ui/lint/lint-ctypes-73251-1.rs stdout ----
diff of stderr:

- error: `extern` block uses type `Qux`, which is not FFI-safe
+ error: `extern` block uses type `impl Baz`, which is not FFI-safe
2   --> $DIR/lint-ctypes-73251-1.rs:21:25
3    |
4 LL |     pub fn lint_me() -> <u32 as Foo>::Assoc;

The actual stderr differed from the expected stderr.
The actual stderr differed from the expected stderr.
Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/lint/lint-ctypes-73251-1/lint-ctypes-73251-1.stderr
To update references, rerun the tests and pass the `--bless` flag
To only update this specific test, also pass `--test-args lint/lint-ctypes-73251-1.rs`
error: 1 errors occurred comparing output.
status: exit code: 1
status: exit code: 1
command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/ui/lint/lint-ctypes-73251-1.rs" "-Zthreads=1" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/lint/lint-ctypes-73251-1" "-A" "unused" "-Crpath" "-O" "-Cdebuginfo=0" "-Zunstable-options" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/lint/lint-ctypes-73251-1/auxiliary"
------------------------------------------

------------------------------------------
stderr:
stderr:
------------------------------------------
error: `extern` block uses type `impl Baz`, which is not FFI-safe
  --> /checkout/src/test/ui/lint/lint-ctypes-73251-1.rs:21:25
   |
LL |     pub fn lint_me() -> <u32 as Foo>::Assoc; //~ ERROR: uses type `Qux`
   |                         ^^^^^^^^^^^^^^^^^^^ not FFI-safe
note: the lint level is defined here
  --> /checkout/src/test/ui/lint/lint-ctypes-73251-1.rs:2:9
   |
LL | #![deny(improper_ctypes)]
LL | #![deny(improper_ctypes)]
   |         ^^^^^^^^^^^^^^^
   = note: opaque types have no C equivalent
error: aborting due to previous error


------------------------------------------
------------------------------------------


---- [ui] ui/lint/lint-ctypes-73251-2.rs stdout ----
diff of stderr:

- error: `extern` block uses type `AliasA`, which is not FFI-safe
+ error: `extern` block uses type `impl TraitA`, which is not FFI-safe
2   --> $DIR/lint-ctypes-73251-2.rs:29:25
3    |
4 LL |     pub fn lint_me() -> <AliasB as TraitB>::Assoc;

The actual stderr differed from the expected stderr.
The actual stderr differed from the expected stderr.
Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/lint/lint-ctypes-73251-2/lint-ctypes-73251-2.stderr
To update references, rerun the tests and pass the `--bless` flag
To only update this specific test, also pass `--test-args lint/lint-ctypes-73251-2.rs`
error: 1 errors occurred comparing output.
status: exit code: 1
status: exit code: 1
command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/ui/lint/lint-ctypes-73251-2.rs" "-Zthreads=1" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/lint/lint-ctypes-73251-2" "-A" "unused" "-Crpath" "-O" "-Cdebuginfo=0" "-Zunstable-options" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/lint/lint-ctypes-73251-2/auxiliary"
------------------------------------------

------------------------------------------
stderr:
stderr:
------------------------------------------
error: `extern` block uses type `impl TraitA`, which is not FFI-safe
  --> /checkout/src/test/ui/lint/lint-ctypes-73251-2.rs:29:25
   |
LL |     pub fn lint_me() -> <AliasB as TraitB>::Assoc; //~ ERROR: uses type `AliasA`
   |                         ^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
note: the lint level is defined here
  --> /checkout/src/test/ui/lint/lint-ctypes-73251-2.rs:2:9
   |
LL | #![deny(improper_ctypes)]
LL | #![deny(improper_ctypes)]
   |         ^^^^^^^^^^^^^^^
   = note: opaque types have no C equivalent
error: aborting due to previous error


------------------------------------------
---
thread 'main' panicked at 'Some tests failed', src/tools/compiletest/src/main.rs:348:22
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace


command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-tools-bin/compiletest" "--compile-lib-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib" "--run-lib-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib/rustlib/x86_64-unknown-linux-gnu/lib" "--rustc-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "--src-base" "/checkout/src/test/ui" "--build-base" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui" "--stage-id" "stage2-x86_64-unknown-linux-gnu" "--mode" "ui" "--target" "x86_64-unknown-linux-gnu" "--host" "x86_64-unknown-linux-gnu" "--llvm-filecheck" "/usr/lib/llvm-8/bin/FileCheck" "--nodejs" "/usr/bin/node" "--host-rustcflags" "-Crpath -O -Cdebuginfo=0 -Zunstable-options  -Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "--target-rustcflags" "-Crpath -O -Cdebuginfo=0 -Zunstable-options  -Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "--docck-python" "/usr/bin/python2.7" "--lldb-python" "/usr/bin/python2.7" "--gdb" "/usr/bin/gdb" "--quiet" "--llvm-version" "8.0.0" "--system-llvm" "--cc" "" "--cxx" "" "--cflags" "" "--llvm-components" "" "--adb-path" "adb" "--adb-test-dir" "/data/tmp/work" "--android-cross-path" "" "--color" "always"


failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test --exclude src/tools/tidy
Build completed unsuccessfully in 1:05:42
Build completed unsuccessfully in 1:05:42
== clock drift check ==
  local time: Tue Jun 16 00:50:07 UTC 2020
  network time: Tue, 16 Jun 2020 00:50:08 GMT
== end clock drift check ==

##[error]Bash exited with code '1'.
##[section]Finishing: Run build
##[section]Starting: Checkout rust-lang/rust@refs/pull/73387/merge to s
Task         : Get sources
Description  : Get sources from a repository. Supports Git, TfsVC, and SVN repositories.
Version      : 1.0.0
Author       : Microsoft
Author       : Microsoft
Help         : [More Information](https://go.microsoft.com/fwlink/?LinkId=798199)
==============================================================================
Cleaning any cached credential from repository: rust-lang/rust (GitHub)
##[section]Finishing: Checkout rust-lang/rust@refs/pull/73387/merge to s
Cleaning up task key
Start cleaning up orphan processes.
Terminate orphan process: pid (3880) (python)
##[section]Finishing: Finalize Job

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@bors r-

@bors bors added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Jun 16, 2020
@Dylan-DPC-zz Dylan-DPC-zz deleted the rollup-6xjwe4r branch June 16, 2020 01:22
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