Fix mis-constructed file_span when generating scraped examples

src/librustdoc/html/render/mod.rs

@@ -59,8 +59,8 @@ use rustc_hir::def_id::{DefId, DefIdSet};
 use rustc_hir::{ConstStability, Mutability, RustcVersion, StabilityLevel, StableSince};
 use rustc_middle::ty::print::PrintTraitRefExt;
 use rustc_middle::ty::{self, TyCtxt};
+use rustc_span::DUMMY_SP;
 use rustc_span::symbol::{Symbol, sym};
-use rustc_span::{BytePos, DUMMY_SP, FileName};
 use tracing::{debug, info};
 
 pub(crate) use self::context::*;
@@ -2779,46 +2779,12 @@ fn render_call_locations<W: fmt::Write>(
         let needs_expansion = line_max - line_min > NUM_VISIBLE_LINES;
         let locations_encoded = serde_json::to_string(&line_ranges).unwrap();
 
-        let source_map = tcx.sess.source_map();
-        let files = source_map.files();
-        let local = tcx.sess.local_crate_source_file().unwrap();
-
-        let get_file_start_pos = || {
-            let crate_src = local.clone().into_local_path()?;
-            let abs_crate_src = crate_src.canonicalize().ok()?;
-            let crate_root = abs_crate_src.parent()?.parent()?;
-            let rel_path = path.strip_prefix(crate_root).ok()?;
-            files
-                .iter()
-                .find(|file| match &file.name {
-                    FileName::Real(real) => real.local_path().map_or(false, |p| p == rel_path),
-                    _ => false,
-                })
-                .map(|file| file.start_pos)
-        };
-
-        // Look for the example file in the source map if it exists, otherwise
-        // return a span to the local crate's source file
-        let Some(file_span) = get_file_start_pos()
-            .or_else(|| {
-                files
-                    .iter()
-                    .find(|file| match &file.name {
-                        FileName::Real(file_name) => file_name == &local,
-                        _ => false,
-                    })
-                    .map(|file| file.start_pos)
-            })
-            .map(|start_pos| {
-                rustc_span::Span::with_root_ctxt(
-                    start_pos + BytePos(byte_min),
-                    start_pos + BytePos(byte_max),
-                )
-            })
-        else {
-            // if the fallback span can't be built, don't render the code for this example
-            return false;
-        };
+        // For scraped examples, we don't need a real span from the SourceMap.
+        // The URL is already provided in ScrapedInfo, and sources::print_src
+        // will use that directly. We use DUMMY_SP as a placeholder.
+        // Note: DUMMY_SP is safe here because href_from_span won't be called
+        // for scraped examples.
+        let file_span = rustc_span::DUMMY_SP;
 
         let mut decoration_info = FxIndexMap::default();
         decoration_info.insert("highlight focus", vec![byte_ranges.remove(0)]);

src/librustdoc/html/sources.rs

@@ -344,9 +344,15 @@ pub(crate) fn print_src(
         lines += line_info.start_line as usize;
     }
     let code = fmt::from_fn(move |fmt| {
-        let current_href = context
-            .href_from_span(clean::Span::new(file_span), false)
-            .expect("only local crates should have sources emitted");
+        // For scraped examples, use the URL from ScrapedInfo directly.
+        // For regular sources, derive it from the span.
+        let current_href = if let SourceContext::Embedded(info) = source_context {
+            info.url.to_string()
+        } else {
+            context
+                .href_from_span(clean::Span::new(file_span), false)
+                .expect("only local crates should have sources emitted")
+        };
         highlight::write_code(
             fmt,
             s,