Add children to heading.

src/context/section.rs

@@ -16,17 +16,24 @@ pub(crate) struct RenderSection {
 }
 
 impl RenderSection {
-    pub(crate) fn new<D: AsRef<Path>, F: AsRef<Path>>(
+    pub(crate) fn new(
         config: &Config,
-        output_directory: D,
-        output_file: F,
+        output_directory: &Path,
+        output_file: &Path,
         section: &ISection,
     ) -> Result<RenderSection, CustomError> {
-        let children = section
-            .children
-            .iter()
-            .map(|obj| RenderElement::new(config, &output_directory, &output_file, obj))
-            .collect::<Result<Vec<_>, _>>()?;
+        let children = {
+            let mut ret = Vec::new();
+            for obj in section.children.iter() {
+                ret.push(RenderElement::new(
+                    config,
+                    &output_directory,
+                    &output_file,
+                    obj,
+                )?);
+            }
+            ret
+        };
 
         Ok(RenderSection { children })
     }