refactor(frontmatter): Clarify the span

src/cargo/util/frontmatter.rs

@@ -286,14 +286,14 @@ fn is_whitespace(c: char) -> bool {
 #[derive(Debug)]
 pub struct FrontmatterError {
     message: String,
-    span: Span,
+    primary_span: Span,
 }
 
 impl FrontmatterError {
     pub fn new(message: impl Into<String>, span: Span) -> Self {
         Self {
             message: message.into(),
-            span,
+            primary_span: span,
         }
     }
 
@@ -301,8 +301,8 @@ impl FrontmatterError {
         self.message.as_str()
     }
 
-    pub fn span(&self) -> Span {
-        self.span.clone()
+    pub fn primary_span(&self) -> Span {
+        self.primary_span.clone()
     }
 }
 

src/cargo/util/toml/mod.rs

@@ -2783,7 +2783,7 @@ fn emit_frontmatter_diagnostic(
     manifest_file: &Path,
     gctx: &GlobalContext,
 ) -> anyhow::Error {
-    let span = e.span();
+    let primary_span = e.primary_span();
 
     // Get the path to the manifest, relative to the cwd
     let manifest_path = diff_paths(manifest_file, gctx.cwd())
@@ -2793,7 +2793,7 @@ fn emit_frontmatter_diagnostic(
     let group = Group::with_title(Level::ERROR.primary_title(e.message())).element(
         Snippet::source(contents)
             .path(manifest_path)
-            .annotation(AnnotationKind::Primary.span(span)),
+            .annotation(AnnotationKind::Primary.span(primary_span)),
     );
 
     if let Err(err) = gctx.shell().print_report(&[group], true) {