rustdoc: Catch fatal errors when syntax highlighting

For some errors the lexer will unwind so we need to handle that in addition to handling `token::Unknown`.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/test/rustdoc/bad-codeblock-syntax.rs b/src/test/rustdoc/bad-codeblock-syntax.rs
index ae8fbe4a2a8..afef86ec9c7 100644
--- a/src/test/rustdoc/bad-codeblock-syntax.rs
+++ b/src/test/rustdoc/bad-codeblock-syntax.rs
@@ -33,3 +33,10 @@ pub fn ok() {}
 /// <script>alert("not valid Rust");</script>
 /// ```
 pub fn escape() {}
+
+// @has bad_codeblock_syntax/fn.unterminated.html
+// @has - '//*[@class="docblock"]/pre/code' '"unterminated'
+/// ```
+/// "unterminated
+/// ```
+pub fn unterminated() {}