rustdoc: Don't try to load source files from external crates

Local items defined in external macros shouldn't generate rendered source files and should link to the external crate's docs instead.

1 files changed, 3 insertions, 2 deletions

diff --git a/src/librustdoc/html/sources.rs b/src/librustdoc/html/sources.rs
index 86f46b2d7e1..c5f44baced2 100644
--- a/src/librustdoc/html/sources.rs
+++ b/src/librustdoc/html/sources.rs
@@ -5,6 +5,7 @@ use crate::html::format::Buffer;
 use crate::html::highlight;
 use crate::html::layout;
 use crate::html::render::{Error, SharedContext, BASIC_KEYWORDS};
+use rustc_hir::def_id::LOCAL_CRATE;
 use rustc_span::source_map::FileName;
 use std::ffi::OsStr;
 use std::fs;
@@ -37,8 +38,8 @@ impl<'a> DocFolder for SourceCollector<'a> {
         if self.scx.include_sources
             // skip all synthetic "files"
             && item.source.filename.is_real()
-            // skip non-local items
-            && item.def_id.is_local()
+            // skip non-local files
+            && item.source.cnum == LOCAL_CRATE
         {
             // If it turns out that we couldn't read this file, then we probably
             // can't read any of the files (generating html output from json or