rustdoc pads spaces in doctest multiline string literals

[sru]

When using multiline string literal in doctest, rustdoc pads spaces after the newline. The doc renders perfectly fine:

I tried this code:

//! Hello world.
//!
//! # Examples
//!
//! ```rust
//! let s = "
//! Hello
//! World";
//! assert_eq!("\nHello\nWorld", s);
//! ```
//!
//! ```rust
//! let s = r#"
//! Hello
//! World"#;
//! assert_eq!("\nHello\nWorld", s);
//! ```

fn main() {
    println!("hello world!");
}

I expected to see this happen: The test should pass.

Instead, this happened: The test failed.

running 2 tests
test _0 ... FAILED
test _1 ... FAILED

failures:

---- _0 stdout ----
    thread '_0' panicked at 'test executable failed:

thread '<main>' panicked at 'assertion failed: `(left == right)` (left: `"\nHello\nWorld"`, right: `"\n    Hello\n    World"`)', <anon>:5
', /Users/rustbuild/src/rust-buildbot/slave/nightly-dist-rustc-mac/build/src/librustdoc/test.rs:255


---- _1 stdout ----
    thread '_1' panicked at 'test executable failed:

thread '<main>' panicked at 'assertion failed: `(left == right)` (left: `"\nHello\nWorld"`, right: `"\n    Hello\n    World"`)', <anon>:5
', /Users/rustbuild/src/rust-buildbot/slave/nightly-dist-rustc-mac/build/src/librustdoc/test.rs:255



failures:
    _0
    _1

test result: FAILED. 0 passed; 2 failed; 0 ignored; 0 measured

"\n    Hello\n    World"

Did you notice it?

Meta

rustc --version --verbose:

rustc 1.2.0-nightly (9cb7b3ffb 2015-06-01) (built 2015-05-31)
binary: rustc
commit-hash: 9cb7b3ffb6522a5fa4d3666b5859d4122c918e44
commit-date: 2015-06-01
build-date: 2015-05-31
host: x86_64-apple-darwin
release: 1.2.0-nightly

rustdoc --version --verbose:

rustdoc 1.2.0-nightly (9cb7b3ffb 2015-06-01) (built 2015-05-31)
binary: rustdoc
commit-hash: 9cb7b3ffb6522a5fa4d3666b5859d4122c918e44
commit-date: 2015-06-01
build-date: 2015-05-31
host: x86_64-apple-darwin
release: 1.2.0-nightly

Backtrace (I don't know if it'd be useful, but):

running 2 tests
test _1 ... FAILED
test _0 ... FAILED

failures:

---- _1 stdout ----
    thread '_1' panicked at 'test executable failed:

thread '<main>' panicked at 'assertion failed: `(left == right)` (left: `"\nHello\nWorld"`, right: `"\n    Hello\n    World"`)', <anon>:5
stack backtrace:
   1:        0x100d057b5 - sys::backtrace::write::h6ede916059f8deceM9r
   2:        0x100d0e754 - panicking::on_panic::ha49f13d0ffb0f10e2uw
   3:        0x100cc8948 - rt::unwind::begin_unwind_inner::hf0bdcaef6fa2453akdw
   4:        0x100cc974c - rt::unwind::begin_unwind_fmt::h040c464af8329e70qcw
   5:        0x100cba5b1 - main::hfc3806f6c4ab636deaa
   6:        0x100d96bf8 - rust_try_inner
   7:        0x100d96be5 - rust_try
   8:        0x100d0f1d0 - rt::lang_start::h5cc5e69c1f0d126e6pw
   9:        0x100cbac2e - main
', /Users/rustbuild/src/rust-buildbot/slave/nightly-dist-rustc-mac/build/src/librustdoc/test.rs:255

stack backtrace:
   1:        0x109c997b5 - sys::backtrace::write::h6ede916059f8deceM9r
   2:        0x109ca23f0 - panicking::on_panic::ha49f13d0ffb0f10e2uw
   3:        0x109c5c948 - rt::unwind::begin_unwind_inner::hf0bdcaef6fa2453akdw
   4:        0x109c5d74c - rt::unwind::begin_unwind_fmt::h040c464af8329e70qcw
   5:        0x105fd28ee - test::runtest::h7eeaa468bba23544cJt
   6:        0x105fd7633 - boxed::F.FnBox<A>::call_box::h15201770880915052160
   7:        0x1062c52ff - boxed::F.FnBox<A>::call_box::h12651187332831451207
   8:        0x1062c2af7 - rt::unwind::try::try_fn::h7876007015214846326
   9:        0x109d2abf8 - rust_try_inner
  10:        0x109d2abe5 - rust_try
  11:        0x109c8c315 - rt::unwind::try::inner_try::hc500934c7d7e0757d9v
  12:        0x1062c2d52 - boxed::F.FnBox<A>::call_box::h17944427202448439759
  13:        0x109ca0eed - sys::thread::Thread::new::thread_start::h5ee5677e14d769eaMxv
  14:     0x7fff870cc898 - _pthread_body
  15:     0x7fff870cc729 - _pthread_start

---- _0 stdout ----
    thread '_0' panicked at 'test executable failed:

thread '<main>' panicked at 'assertion failed: `(left == right)` (left: `"\nHello\nWorld"`, right: `"\n    Hello\n    World"`)', <anon>:5
stack backtrace:
   1:        0x1057357b5 - sys::backtrace::write::h6ede916059f8deceM9r
   2:        0x10573e754 - panicking::on_panic::ha49f13d0ffb0f10e2uw
   3:        0x1056f8948 - rt::unwind::begin_unwind_inner::hf0bdcaef6fa2453akdw
   4:        0x1056f974c - rt::unwind::begin_unwind_fmt::h040c464af8329e70qcw
   5:        0x1056e85b1 - main::h3811a6db7063b18feaa
   6:        0x1057c6bf8 - rust_try_inner
   7:        0x1057c6be5 - rust_try
   8:        0x10573f1d0 - rt::lang_start::h5cc5e69c1f0d126e6pw
   9:        0x1056e8c2e - main
', /Users/rustbuild/src/rust-buildbot/slave/nightly-dist-rustc-mac/build/src/librustdoc/test.rs:255

stack backtrace:
   1:        0x109c997b5 - sys::backtrace::write::h6ede916059f8deceM9r
   2:        0x109ca23f0 - panicking::on_panic::ha49f13d0ffb0f10e2uw
   3:        0x109c5c948 - rt::unwind::begin_unwind_inner::hf0bdcaef6fa2453akdw
   4:        0x109c5d74c - rt::unwind::begin_unwind_fmt::h040c464af8329e70qcw
   5:        0x105fd28ee - test::runtest::h7eeaa468bba23544cJt
   6:        0x105fd7633 - boxed::F.FnBox<A>::call_box::h15201770880915052160
   7:        0x1062c52ff - boxed::F.FnBox<A>::call_box::h12651187332831451207
   8:        0x1062c2af7 - rt::unwind::try::try_fn::h7876007015214846326
   9:        0x109d2abf8 - rust_try_inner
  10:        0x109d2abe5 - rust_try
  11:        0x109c8c315 - rt::unwind::try::inner_try::hc500934c7d7e0757d9v
  12:        0x1062c2d52 - boxed::F.FnBox<A>::call_box::h17944427202448439759
  13:        0x109ca0eed - sys::thread::Thread::new::thread_start::h5ee5677e14d769eaMxv
  14:     0x7fff870cc898 - _pthread_body
  15:     0x7fff870cc729 - _pthread_start


failures:
    _0
    _1

test result: FAILED. 0 passed; 2 failed; 0 ignored; 0 measured

thread '<unnamed>' panicked at 'Some tests failed', /Users/rustbuild/src/rust-buildbot/slave/nightly-dist-rustc-mac/build/src/libtest/lib.rs:255
stack backtrace:
   1:        0x109c997b5 - sys::backtrace::write::h6ede916059f8deceM9r
   2:        0x109ca2754 - panicking::on_panic::ha49f13d0ffb0f10e2uw
   3:        0x109c5c948 - rt::unwind::begin_unwind_inner::hf0bdcaef6fa2453akdw
   4:        0x10629d43f - rt::unwind::begin_unwind::h16661391803926304236
   5:        0x1062a088e - test_main::h4adc4874d4cee238R0a
   6:        0x105fc9890 - test::run::ha93ed6fea45d1225kCt
   7:        0x105fdd955 - main_args::hfa89131528ad43189fu
   8:        0x105fda0f5 - boxed::F.FnBox<A>::call_box::h543229893963805859
   9:        0x105fd9257 - rt::unwind::try::try_fn::h8218846930259623130
  10:        0x109d2abf8 - rust_try_inner
  11:        0x109d2abe5 - rust_try
  12:        0x109c8c315 - rt::unwind::try::inner_try::hc500934c7d7e0757d9v
  13:        0x105fd94d7 - boxed::F.FnBox<A>::call_box::h132574837825853843
  14:        0x109ca0eed - sys::thread::Thread::new::thread_start::h5ee5677e14d769eaMxv
  15:     0x7fff870cc898 - _pthread_body
  16:     0x7fff870cc729 - _pthread_start
thread '<main>' panicked at 'called `Result::unwrap()` on an `Err` value: Any', /Users/rustbuild/src/rust-buildbot/slave/nightly-dist-rustc-mac/build/src/libcore/result.rs:729
stack backtrace:
   1:        0x109c997b5 - sys::backtrace::write::h6ede916059f8deceM9r
   2:        0x109ca2754 - panicking::on_panic::ha49f13d0ffb0f10e2uw
   3:        0x109c5c948 - rt::unwind::begin_unwind_inner::hf0bdcaef6fa2453akdw
   4:        0x109c5d74c - rt::unwind::begin_unwind_fmt::h040c464af8329e70qcw
   5:        0x109ca1f4c - rust_begin_unwind
   6:        0x109cf6cb5 - panicking::panic_fmt::he351326af800e539i5B
   7:        0x105fd8e1c - main::h7b823c409ceca183Wbu
   8:        0x109d2abf8 - rust_try_inner
   9:        0x109d2abe5 - rust_try
  10:        0x109ca31d0 - rt::lang_start::h5cc5e69c1f0d126e6pw

[aochagavia]

I hit this issue today as well with a similar case

[bltavares]

Triaging: This is still happening on rustdoc 1.9.0-nightly (5ab11d72c 2016-04-02)