Fix wrong rounded corners when line numbers are displayed on code examples

Author: GuillaumeGomez

src/librustdoc/html/static/css/rustdoc.css

@@ -749,6 +749,19 @@ ul.block, .block li {
 	border-radius: 6px;
 }
 
+/*
+If the code example line numbers are displayed, there will be a weird radius in the middle from
+both the code example and the line numbers, so we need to remove the radius in this case.
+*/
+.rustdoc .example-wrap > .example-line-numbers {
+	border-top-right-radius: 0;
+	border-bottom-right-radius: 0;
+}
+.rustdoc .example-wrap > .example-line-numbers + pre {
+	border-top-left-radius: 0;
+	border-bottom-left-radius: 0;
+}
+
 /* For the last child of a div, the margin will be taken care of
 	by the margin-top of the next item. */
 .rustdoc .example-wrap:last-child {