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Add implicit result return for rustdoc main function #56310

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Add implicit result return for rustdoc main function #56310

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GuillaumeGomez
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@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Nov 28, 2018
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The job x86_64-gnu-llvm-5.0 of your PR failed on Travis (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. 
travis_time:end:18a6a24a:start=1543411553080475180,finish=1543411554109725659,duration=1029250479
$ git checkout -qf FETCH_HEAD
travis_fold:end:git.checkout

Encrypted environment variables have been removed for security reasons.
See https://docs.travis-ci.com/user/pull-requests/#Pull-Requests-and-Security-Restrictions
$ export SCCACHE_BUCKET=rust-lang-ci-sccache2
$ export SCCACHE_REGION=us-west-1
Setting environment variables from .travis.yml
$ export IMAGE=x86_64-gnu-llvm-5.0
---
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---
travis_time:start:test_codegen
Check compiletest suite=codegen mode=codegen (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
[01:04:24] 
[01:04:24] running 117 tests
[01:04:27] i..ii...iii..iiii.....i...i.........i..iii...........i.....i.....ii...i..i.ii..............i...ii..i 100/117
[01:04:28] i.i.....iiii.....
[01:04:28] 
[01:04:28]  finished in 3.418
[01:04:28] travis_fold:end:test_codegen

---
travis_time:start:test_debuginfo
Check compiletest suite=debuginfo mode=debuginfo-both (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
[01:04:42] 
[01:04:42] running 118 tests
[01:05:05] .iiiii...i.....i..i...i..i.i..i.i..i.....i..i....i..........iiii.........i.i....i...i.......ii.i.i.i 100/118
[01:05:09] ......iii.i.....ii
[01:05:09] 
[01:05:09]  finished in 27.497
[01:05:09] travis_fold:end:test_debuginfo

---
travis_time:start:test_rustdoc
Check compiletest suite=rustdoc mode=rustdoc (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
[01:11:42] 
[01:11:42] running 276 tests
[01:12:51] .......................i.......F.................................................................... 100/276
[01:13:47] ......................F.....F...i.........F....................F.................................... 200/276
[01:14:30] ...............F..F.....................................FF..................
[01:14:30] 
[01:14:30] thread 'main' panicked at 'Some tests failed', src/tools/compiletest/src/main.rs:503:22
[01:14:30] ---- [rustdoc] rustdoc/edition-doctest.rs stdout ----
[01:14:30] 
---
[01:14:30]   --> /checkout/src/test/rustdoc/edition-doctest.rs:15:29
[01:14:30]    |
[01:14:30] 4  |   fn main() -> Result<(), ()> {
[01:14:30]    |  _____________________________^
[01:14:30] 5  | | use std::num::ParseIntError;
[01:14:30] 6  | |
[01:14:30] 7  | | let result: Result<i32, ParseIntError> = try {
[01:14:30] ...  |
[01:14:30] 19 | | assert!(result.is_err());
[01:14:30]    | |_^ expected enum `std::result::Result`, found ()
[01:14:30]    |
[01:14:30]    = note: expected type `std::result::Result<(), ()>`
[01:14:30]               found type `()`
---
[01:14:30] ---- [rustdoc] rustdoc/issue-23106.rs stdout ----
[01:14:30] 
[01:14:30] error: rustdoc failed!
[01:14:30] status: exit code: 101
[01:14:30] command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustdoc" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/rustdoc/issue-23106/auxiliary" "-o" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/rustdoc/issue-23106" "/checkout/src/test/rustdoc/issue-23106.rs" "--test"
[01:14:30] ------------------------------------------
[01:14:30] 
[01:14:30] running 1 test
[01:14:30] test /checkout/src/test/rustdoc/issue-23106.rs - main (line 13) ... FAILED
---
[01:14:30] ---- [rustdoc] rustdoc/issue-25944.rs stdout ----
[01:14:30] 
[01:14:30] error: rustdoc failed!
[01:14:30] status: exit code: 101
[01:14:30] command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustdoc" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/rustdoc/issue-25944/auxiliary" "-o" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/rustdoc/issue-25944" "/checkout/src/test/rustdoc/issue-25944.rs" "--test"
[01:14:30] ------------------------------------------
[01:14:30] 
[01:14:30] running 1 test
[01:14:30] test /checkout/src/test/rustdoc/issue-25944.rs - main (line 13) ... FAILED
---
[01:14:30]  --> /checkout/src/test/rustdoc/issue-25944.rs:13:29
[01:14:30]   |
[01:14:30] 2 |   fn main() -> Result<(), ()> {
[01:14:30]   |  _____________________________^
[01:14:30] 3 | | let a = r#"
[01:14:30] 4 | | foo
[01:14:30] 5 | | bar"#;
[01:14:30] 6 | | let b = "\nfoo\nbar";
[01:14:30] 7 | | assert_eq!(a, b);
[01:14:30]   | |_^ expected enum `std::result::Result`, found ()
[01:14:30]   |
[01:14:30]   = note: expected type `std::result::Result<(), ()>`
[01:14:30]              found type `()`
---
[01:14:30] ---- [rustdoc] rustdoc/issue-30252.rs stdout ----
[01:14:30] 
[01:14:30] error: rustdoc failed!
[01:14:30] status: exit code: 101
[01:14:30] command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustdoc" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/rustdoc/issue-30252/auxiliary" "-o" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/rustdoc/issue-30252" "/checkout/src/test/rustdoc/issue-30252.rs" "--test" "--cfg" "feature=\"bar\""
[01:14:30] ------------------------------------------
[01:14:30] 
[01:14:30] running 1 test
[01:14:30] test /checkout/src/test/rustdoc/issue-30252.rs - foo (line 13) ... FAILED
---
[01:14:30]  --> /checkout/src/test/rustdoc/issue-30252.rs:13:29
[01:14:30]   |
[01:14:30] 2 |   fn main() -> Result<(), ()> {
[01:14:30]   |  _____________________________^
[01:14:30] 3 | | assert_eq!(cfg!(feature = "bar"), true);
[01:14:30]   | |_^ expected enum `std::result::Result`, found ()
[01:14:30]   |
[01:14:30]   = note: expected type `std::result::Result<(), ()>`
[01:14:30]              found type `()`
---
[01:14:30] ---- [rustdoc] rustdoc/issue-38129.rs stdout ----
[01:14:30] 
[01:14:30] error: rustdoc failed!
[01:14:30] status: exit code: 101
[01:14:30] command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustdoc" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/rustdoc/issue-38129/auxiliary" "-o" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/rustdoc/issue-38129" "/checkout/src/test/rustdoc/issue-38129.rs" "--test"
[01:14:30] ------------------------------------------
[01:14:30] 
[01:14:30] running 5 tests
[01:14:30] test /checkout/src/test/rustdoc/issue-38129.rs - feature_attr (line 51) ... FAILED
---
[01:14:30]  --> /checkout/src/test/rustdoc/issue-38129.rs:52:29
[01:14:30]   |
[01:14:30] 3 |   fn main() -> Result<(), ()> {
[01:14:30]   |  _____________________________^
[01:14:30] 4 | | assert_eq!(1 + 1, 2);
[01:14:30]   | |_^ expected enum `std::result::Result`, found ()
[01:14:30]   |
[01:14:30]   = note: expected type `std::result::Result<(), ()>`
[01:14:30]              found type `()`
---
[01:14:30]   --> /checkout/src/test/rustdoc/issue-38129.rs:26:29
[01:14:30]    |
[01:14:30] 3  |   fn main() -> Result<(), ()> {
[01:14:30]    |  _____________________________^
[01:14:30] 4  | | macro_rules! recurse {
[01:14:30] 5  | |     (()) => {};
[01:14:30] 6  | |     (() $($rest:tt)*) => { recurse!($($rest)*); }
[01:14:30] ...  |
[01:14:30] 24 | | assert_eq!(1 + 1, 2);
[01:14:30]    | |_^ expected enum `std::result::Result`, found ()
[01:14:30]    |
[01:14:30]    = note: expected type `std::result::Result<(), ()>`
[01:14:30]               found type `()`
---
[01:14:30]   --> /checkout/src/test/rustdoc/issue-38129.rs:86:29
[01:14:30]    |
[01:14:30] 4  |   fn main() -> Result<(), ()> {
[01:14:30]    |  _____________________________^
[01:14:30] 5  | | macro_rules! recurse {
[01:14:30] 6  | |     (()) => {};
[01:14:30] 7  | |     (() $($rest:tt)*) => { recurse!($($rest)*); }
[01:14:30] ...  |
[01:14:30] 25 | | assert_eq!(1 + 1, 2);
[01:14:30]    | |_^ expected enum `std::result::Result`, found ()
[01:14:30]    |
[01:14:30]    = note: expected type `std::result::Result<(), ()>`
[01:14:30]               found type `()`
---
[01:14:30]   --> /checkout/src/test/rustdoc/issue-38129.rs:59:29
[01:14:30]    |
[01:14:30] 4  |   fn main() -> Result<(), ()> {
[01:14:30]    |  _____________________________^
[01:14:30] 5  | | macro_rules! recurse {
[01:14:30] 6  | |     (()) => {};
[01:14:30] 7  | |     (() $($rest:tt)*) => { recurse!($($rest)*); }
[01:14:30] ...  |
[01:14:30] 25 | | assert_eq!(1 + 1, 2);
[01:14:30]    | |_^ expected enum `std::result::Result`, found ()
[01:14:30]    |
[01:14:30]    = note: expected type `std::result::Result<(), ()>`
[01:14:30]               found type `()`
---
[01:14:30]  --> /checkout/src/test/rustdoc/issue-38129.rs:20:29
[01:14:30]   |
[01:14:30] 2 |   fn main() -> Result<(), ()> {
[01:14:30]   |  _____________________________^
[01:14:30] 3 | | assert_eq!(1 + 1, 2);
[01:14:30]   | |_^ expected enum `std::result::Result`, found ()
[01:14:30]   |
[01:14:30]   = note: expected type `std::result::Result<(), ()>`
[01:14:30]              found type `()`
---
[01:14:30] thread '[rustdoc] rustdoc/issue-38129.rs' panicked at 'explicit panic', src/tools/compiletest/src/runtest.rs:3282:9
[01:14:30] 
[01:14:30] ---- [rustdoc] rustdoc/playground-arg.rs stdout ----
[01:14:30] 
[01:14:30] error: htmldocck failed!
[01:14:30] status: exit code: 1
[01:14:30] command: "/usr/bin/python2.7" "/checkout/src/etc/htmldocck.py" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/rustdoc/playground-arg" "/checkout/src/test/rustdoc/playground-arg.rs"
[01:14:30] ------------------------------------------
[01:14:30] 
[01:14:30] ------------------------------------------
[01:14:30] stderr:
[01:14:30] stderr:
[01:14:30] ------------------------------------------
[01:14:30] 24: @matches check failed
[01:14:30]  `XPATH PATTERN` did not match
[01:14:30]  // @matches foo/index.html '//a[@class="test-arrow"][@href="https://example.com/?code=%23!%5Ballow(unused)%5D%0Aextern%20crate%20foo%3B%0Afn%20main()%20%7B%0Ause%20foo%3A%3Adummy%3B%0Adummy()%3B%0A%7D"]' "Run"
[01:14:30] Encountered 1 errors
[01:14:30] 
[01:14:30] ------------------------------------------
[01:14:30] 
[01:14:30] 
[01:14:30] thread '[rustdoc] rustdoc/playground-arg.rs' panicked at 'explicit panic', src/tools/compiletest/src/runtest.rs:3282:9
[01:14:30] 
[01:14:30] ---- [rustdoc] rustdoc/playground.rs stdout ----
[01:14:30] 
[01:14:30] error: htmldocck failed!
[01:14:30] status: exit code: 1
[01:14:30] command: "/usr/bin/python2.7" "/checkout/src/etc/htmldocck.py" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/rustdoc/playground" "/checkout/src/test/rustdoc/playground.rs"
[01:14:30] ------------------------------------------
[01:14:30] 
[01:14:30] ------------------------------------------
[01:14:30] stderr:
[01:14:30] stderr:
[01:14:30] ------------------------------------------
[01:14:30] 38: @matches check failed
[01:14:30]  `XPATH PATTERN` did not match
[01:14:30]  // @matches foo/index.html '//a[@class="test-arrow"][@href="https://www.example.com/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Aprintln!(%22Hello%2C%20world!%22)%3B%0A%7D"]' "Run"
[01:14:30] Encountered 1 errors
[01:14:30] 
[01:14:30] ------------------------------------------
[01:14:30] 
[01:14:30] 
[01:14:30] thread '[rustdoc] rustdoc/playground.rs' panicked at 'explicit panic', src/tools/compiletest/src/runtest.rs:3282:9
[01:14:30] 
[01:14:30] ---- [rustdoc] rustdoc/test_option_check/bar.rs stdout ----
[01:14:30] 
[01:14:30] error: rustdoc failed!
[01:14:30] status: exit code: 101
[01:14:30] command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustdoc" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/rustdoc/test_option_check/bar/auxiliary" "-o" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/rustdoc/test_option_check/bar" "/checkout/src/test/rustdoc/test_option_check/bar.rs" "--test"
[01:14:30] ------------------------------------------
[01:14:30] 
[01:14:30] running 1 test
[01:14:30] running 1 test
[01:14:30] test /checkout/src/test/rustdoc/test_option_check/bar.rs - foooo (line 16) ... FAILED
[01:14:30] failures:
[01:14:30] 
[01:14:30] 
[01:14:30] ---- /checkout/src/test/rustdoc/test_option_check/bar.rs - foooo (line 16) stdout ----
[01:14:30]  --> /checkout/src/test/rustdoc/test_option_check/bar.rs:16:29
[01:14:30]   |
[01:14:30] 2 |   fn main() -> Result<(), ()> {
[01:14:30]   |  _____________________________^
[01:14:30]   |  _____________________________^
[01:14:30] 3 | | println!("foo?");
[01:14:30]   | |_^ expected enum `std::result::Result`, found ()
[01:14:30]   |
[01:14:30]   = note: expected type `std::result::Result<(), ()>`
[01:14:30]              found type `()`
[01:14:30]              found type `()`
[01:14:30] 
[01:14:30] thread '/checkout/src/test/rustdoc/test_option_check/bar.rs - foooo (line 16)' panicked at 'couldn't compile the test', src/librustdoc/test.rs:323:13
[01:14:30] 
[01:14:30] 
[01:14:30] failures:
[01:14:30] failures:
[01:14:30]     /checkout/src/test/rustdoc/test_option_check/bar.rs - foooo (line 16)
[01:14:30] test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out
[01:14:30] 
[01:14:30] 
[01:14:30] ------------------------------------------
---
[01:14:30] stdout:
[01:14:30] ------------------------------------------
[01:14:30] 
[01:14:30] running 3 tests
[01:14:30] test /checkout/src/test/rustdoc/test_option_check/bar.rs - bar::foooo (line 16) ... FAILED
[01:14:30] test /checkout/src/test/rustdoc/test_option_check/test.rs - Foo (line 18) ... FAILED
[01:14:30] test /checkout/src/test/rustdoc/test_option_check/test.rs - Bar (line 25) ... FAILED
[01:14:30] failures:
[01:14:30] 
[01:14:30] 
[01:14:30] ---- /checkout/src/test/rustdoc/test_option_check/bar.rs - bar::foooo (line 16) stdout ----
[01:14:30]  --> /checkout/src/test/rustdoc/test_option_check/bar.rs:16:29
[01:14:30]   |
[01:14:30] 2 |   fn main() -> Result<(), ()> {
[01:14:30]   |  _____________________________^
[01:14:30]   |  _____________________________^
[01:14:30] 3 | | println!("foo?");
[01:14:30]   | |_^ expected enum `std::result::Result`, found ()
[01:14:30]   |
[01:14:30]   = note: expected type `std::result::Result<(), ()>`
[01:14:30]              found type `()`
[01:14:30]              found type `()`
[01:14:30] 
[01:14:30] thread '/checkout/src/test/rustdoc/test_option_check/bar.rs - bar::foooo (line 16)' panicked at 'couldn't compile the test', src/librustdoc/test.rs:323:13
[01:14:30] 
[01:14:30] ---- /checkout/src/test/rustdoc/test_option_check/test.rs - Foo (line 18) stdout ----
[01:14:30] error[E0308]: mismatched types
[01:14:30]  --> /checkout/src/test/rustdoc/test_option_check/test.rs:18:29
[01:14:30]  --> /checkout/src/test/rustdoc/test_option_check/test.rs:18:29
[01:14:30]   |
[01:14:30] 2 |   fn main() -> Result<(), ()> {
[01:14:30]   |  _____________________________^
[01:14:30] 3 | | println!("baaaaaar");
[01:14:30]   | |_^ expected enum `std::result::Result`, found ()
[01:14:30]   |
[01:14:30]   = note: expected type `std::result::Result<(), ()>`
[01:14:30]              found type `()`
---
[01:14:30]  --> /checkout/src/test/rustdoc/test_option_check/test.rs:25:29
[01:14:30]   |
[01:14:30] 2 |   fn main() -> Result<(), ()> {
[01:14:30]   |  _____________________________^
[01:14:30] 3 | | println!("fooooo");
[01:14:30]   | |_^ expected enum `std::result::Result`, found ()
[01:14:30]   |
[01:14:30]   = note: expected type `std::result::Result<(), ()>`
[01:14:30]              found type `()`
[01:14:30]              found type `()`
[01:14:30] 
[01:14:30] thread '/checkout/src/test/rustdoc/test_option_check/test.rs - Bar (line 25)' panicked at 'couldn't compile the test', src/librustdoc/test.rs:323:13
[01:14:30] 
[01:14:30] 
[01:14:30] failures:
[01:14:30]     /checkout/src/test/rustdoc/test_option_check/bar.rs - bar::foooo (line 16)
[01:14:30]     /checkout/src/test/rustdoc/test_option_check/test.rs - Bar (line 25)
[01:14:30]     /checkout/src/test/rustdoc/test_option_check/test.rs - Foo (line 18)
[01:14:30] test result: FAILED. 0 passed; 3 failed; 0 ignored; 0 measured; 0 filtered out
[01:14:30] 
[01:14:30] 
[01:14:30] ------------------------------------------
---
[01:14:30] test result: FAILED. 265 passed; 9 failed; 2 ignored; 0 measured; 0 filtered out
[01:14:30] 
[01:14:30] 
[01:14:30] 
[01:14:30] 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" "--rustdoc-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustdoc" "--src-base" "/checkout/src/test/rustdoc" "--build-base" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/rustdoc" "--stage-id" "stage2-x86_64-unknown-linux-gnu" "--mode" "rustdoc" "--target" "x86_64-unknown-linux-gnu" "--host" "x86_64-unknown-linux-gnu" "--llvm-filecheck" "/usr/lib/llvm-5.0/bin/FileCheck" "--host-rustcflags" "-Crpath -O -Zunstable-options " "--target-rustcflags" "-Crpath -O -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" "5.0.0\n" "--system-llvm" "--cc" "" "--cxx" "" "--cflags" "" "--llvm-components" "" "--llvm-cxxflags" "" "--adb-path" "adb" "--adb-test-dir" "/data/tmp/work" "--android-cross-path" "" "--color" "always"
[01:14:30] 
[01:14:30] 
[01:14:30] failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test
[01:14:30] Build completed unsuccessfully in 0:29:17
[01:14:30] Build completed unsuccessfully in 0:29:17
[01:14:30] Makefile:58: recipe for target 'check' failed
[01:14:30] make: *** [check] Error 1
The command "stamp sh -x -c "$RUN_SCRIPT"" exited with 2.
travis_time:start:1810dc00
$ date && (curl -fs --head https://google.com | grep ^Date: | sed 's/Date: //g' || true)
Wed Nov 28 14:40:33 UTC 2018
---
travis_time:end:1778c78a:start=1543416037505541923,finish=1543416037511337796,duration=5795873
travis_fold:end:after_failure.3
travis_fold:start:after_failure.4
travis_time:start:03302ca0
$ ln -s . checkout && for CORE in obj/cores/core.*; do EXE=$(echo $CORE | sed 's|obj/co

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

@GuillaumeGomez
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I'll need to check if a function ends with an Ok or a Result...

@Centril Centril added the relnotes Marks issues that should be documented in the release notes of the next release. label Nov 30, 2018
@ollie27
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ollie27 commented Dec 2, 2018

I'm not sure this can be done. It'll not only have to detect if the code returns Result but also what error type it uses because not many things use ().

@GuillaumeGomez
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I think it's worth a try but I was expecting a bit too much. :)

@QuietMisdreavus
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This conflicts with #56470.

@GuillaumeGomez
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Indeed, I'll close it in favor of #56470.

@GuillaumeGomez GuillaumeGomez deleted the test-rustdoc-implicit-result branch December 4, 2018 08:49
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relnotes Marks issues that should be documented in the release notes of the next release. S-waiting-on-review Status: Awaiting review from the assignee but also interested parties.
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@GuillaumeGomez @rust-highfive @ollie27 @QuietMisdreavus @Centril