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-rw-r--r--src/bootstrap/doc.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/bootstrap/doc.rs b/src/bootstrap/doc.rs
index 44073a5b075..06340a4e98a 100644
--- a/src/bootstrap/doc.rs
+++ b/src/bootstrap/doc.rs
@@ -696,6 +696,7 @@ impl Step for Rustc {
         t!(symlink_dir_force(&out, &out_dir));
 
         let mut cargo = builder.cargo(compiler, Mode::Librustc, target, "doc");
+        cargo.env("RUSTDOCFLAGS", "--document-private-items");
         compile::rustc_cargo(build, &mut cargo);
 
         // Only include compiler crates, no dependencies of those, such as `libc`.