optmulti bug fix for --include-rendered-docs

Author: EtomicBomb

src/librustdoc/html/render/write_shared.rs

@@ -285,7 +285,7 @@ impl<T, U: fmt::Display> fmt::Display for Part<T, U> {
 }
 
 /// Wrapper trait for `Part<T, U>`
-pub(crate) trait CciPart: Sized + fmt::Display + 'static {
+trait CciPart: Sized + fmt::Display + 'static {
     /// Identifies the kind of cross crate information.
     ///
     /// The cci type name in `doc.parts/<cci type>`

src/librustdoc/lib.rs

@@ -631,7 +631,7 @@ fn opts() -> Vec<RustcOptGroup> {
             )
         }),
         unstable("include-rendered-docs", |o| {
-            o.optopt(
+            o.optmulti(
                 "",
                 "include-rendered-docs",
                 "Copies docs from an external crate to the --out-dir. Expects PATH to be a path directly