Add test to ensure tables are not inside items summary

src/test/rustdoc-gui/item-summary-table.goml

@@ -0,0 +1,6 @@
+// This test ensures that <table> elements aren't display in items summary.
+goto: file://|DOC_PATH|/lib2/summary_table/index.html
+// We check that we picked the right item first.
+assert-text: (".item-table .item-left", "Foo")
+// Then we check that its summary is empty.
+assert-text: (".item-table .item-right", "")

src/test/rustdoc-gui/src/lib2/lib.rs

@@ -66,3 +66,10 @@ pub mod long_table {
     /// I wanna sqdkfnqds f dsqf qds f dsqf dsq f dsq f qds f qds f qds f dsqq f dsf sqdf dsq fds f dsq f dq f ds fq sd fqds f dsq f sqd fsq df sd fdsqfqsd fdsq f dsq f dsqfd s dfq
     pub struct Foo;
 }
+
+pub mod summary_table {
+    /// | header 1 | header 2 |
+    /// | -------- | -------- |
+    /// | content | content |
+    pub struct Foo;
+}