Don't display <table> in item summary

src/librustdoc/html/markdown.rs

@@ -57,7 +57,7 @@ pub(crate) fn opts() -> Options {
 
 /// A subset of [`opts()`] used for rendering summaries.
 pub(crate) fn summary_opts() -> Options {
-    Options::ENABLE_STRIKETHROUGH | Options::ENABLE_SMART_PUNCTUATION
+    Options::ENABLE_STRIKETHROUGH | Options::ENABLE_SMART_PUNCTUATION | Options::ENABLE_TABLES
 }
 
 /// When `to_string` is called, this struct will emit the HTML corresponding to
@@ -522,6 +522,10 @@ fn check_if_allowed_tag(t: &Tag<'_>) -> bool {
     )
 }
 
+fn is_forbidden_tag(t: &Tag<'_>) -> bool {
+    matches!(t, Tag::CodeBlock(_) | Tag::Table(_) | Tag::TableHead | Tag::TableRow | Tag::TableCell)
+}
+
 impl<'a, I: Iterator<Item = Event<'a>>> Iterator for SummaryLine<'a, I> {
     type Item = Event<'a>;
 
@@ -535,14 +539,17 @@ impl<'a, I: Iterator<Item = Event<'a>>> Iterator for SummaryLine<'a, I> {
         if let Some(event) = self.inner.next() {
             let mut is_start = true;
             let is_allowed_tag = match event {
-                Event::Start(Tag::CodeBlock(_)) | Event::End(Tag::CodeBlock(_)) => {
-                    return None;
-                }
                 Event::Start(ref c) => {
+                    if is_forbidden_tag(c) {
+                        return None;
+                    }
                     self.depth += 1;
                     check_if_allowed_tag(c)
                 }
                 Event::End(ref c) => {
+                    if is_forbidden_tag(c) {
+                        return None;
+                    }
                     self.depth -= 1;
                     is_start = false;
                     check_if_allowed_tag(c)

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;
+}