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doctests: fix merging on stable #1

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doctests: fix merging on stable #1

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7 changes: 6 additions & 1 deletion src/librustdoc/doctest.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -550,7 +550,12 @@ fn run_test(
}

compiler.arg("--edition").arg(doctest.edition.to_string());
if !doctest.is_multiple_tests {
if doctest.is_multiple_tests {
// The merged test harness uses the `test` crate, so we need to actually allow it.
// This will not expose nightly features on stable, because crate attrs disable
// merging, and `#![feature]` is required to be a crate attr.
compiler.env("RUSTC_BOOTSTRAP", "1");
} else {
// Setting these environment variables is unneeded if this is a merged doctest.
compiler.env("UNSTABLE_RUSTDOC_TEST_PATH", &doctest.test_opts.path);
compiler.env(
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