port headers!

compiler/reporting/src/error/parse.rs

@@ -2800,6 +2800,29 @@ fn to_imports_report<'a>(
 
         EImports::Space(error, row, col) => to_space_report(alloc, filename, &error, row, col),
 
+        EImports::ModuleName(row, col) => {
+            let surroundings = Region::from_rows_cols(start_row, start_col, row, col);
+            let region = Region::from_row_col(row, col);
+
+            let doc = alloc.stack(vec![
+                alloc.reflow(r"I am partway through parsing a header, but got stuck here:"),
+                alloc.region_with_subregion(surroundings, region),
+                alloc.concat(vec![
+                    alloc.reflow("I am expecting a module name next, like "),
+                    alloc.parser_suggestion("BigNum"),
+                    alloc.reflow(" or "),
+                    alloc.parser_suggestion("Main"),
+                    alloc.reflow(". Module names must start with an uppercase letter."),
+                ]),
+            ]);
+
+            Report {
+                filename,
+                doc,
+                title: "WEIRD MODULE NAME".to_string(),
+            }
+        }
+
         _ => todo!("unhandled parse error {:?}", parse_problem),
     }
 }