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Auto merge of #79064 - ehuss:rustbook-logs, r=Mark-Simulacrum
Fix displaying errors when rustbook tests fail. This ensures that output from mdbook is displayed when running the rustbook wrapper. I believe this was a regression as a result of #69115 where it was changed from running `rustdoc` directly to using rustbook.
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Cargo.lock

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@@ -3023,6 +3023,7 @@ name = "rustbook"
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version = "0.1.0"
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dependencies = [
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"clap",
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"env_logger 0.7.1",
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"mdbook",
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]
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src/tools/rustbook/Cargo.toml

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@@ -7,6 +7,7 @@ edition = "2018"
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[dependencies]
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clap = "2.25.0"
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env_logger = "0.7.1"
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[dependencies.mdbook]
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version = "0.4.3"

src/tools/rustbook/src/main.rs

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@@ -9,6 +9,7 @@ use mdbook::errors::Result as Result3;
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use mdbook::MDBook;
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fn main() {
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env_logger::Builder::from_env(env_logger::Env::default().default_filter_or("warn")).init();
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let d_message = "-d, --dest-dir=[dest-dir]
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'The output directory for your book{n}(Defaults to ./book when omitted)'";
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let dir_message = "[dir]

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