diff --git a/src/test/rustdoc-gui/src/lib2/lib.rs b/src/test/rustdoc-gui/src/lib2/lib.rs
index d5835b78d2fcf..f2e76b546c4af 100644
--- a/src/test/rustdoc-gui/src/lib2/lib.rs
+++ b/src/test/rustdoc-gui/src/lib2/lib.rs
@@ -84,3 +84,20 @@ pub mod summary_table {
     /// | content | content |
     pub struct Foo;
 }
+
+pub mod too_long {
+pub type ReallyLongTypeNameLongLongLong = Option<unsafe extern "C" fn(a: *const u8, b: *const u8) -> *const u8>;
+
+pub const ReallyLongTypeNameLongLongLongConstBecauseWhyNotAConstRightGigaGigaSupraLong: u32 = 0;
+
+pub struct SuperIncrediblyLongLongLongLongLongLongLongGigaGigaGigaMegaLongLongLongStructName {
+    pub a: u32,
+}
+
+impl SuperIncrediblyLongLongLongLongLongLongLongGigaGigaGigaMegaLongLongLongStructName {
+    /// ```
+    /// let x = SuperIncrediblyLongLongLongLongLongLongLongGigaGigaGigaMegaLongLongLongStructName { a: 0 };
+    /// ```
+        pub fn foo(&self) {}
+    }
+}
diff --git a/src/test/rustdoc-gui/type-declation-overflow.goml b/src/test/rustdoc-gui/type-declation-overflow.goml
index ab38b28ebfc1f..63ab867fb1772 100644
--- a/src/test/rustdoc-gui/type-declation-overflow.goml
+++ b/src/test/rustdoc-gui/type-declation-overflow.goml
@@ -1,4 +1,4 @@
-// This test ensures that the type declaration content overflow is handled inside the <pre> directly.
+// This test ensures that the items declaration content overflow is handled inside the <pre> directly.
 goto: file://|DOC_PATH|/lib2/long_trait/trait.ALongNameBecauseItHelpsTestingTheCurrentProblem.html
 // We set a fixed size so there is no chance of "random" resize.
 size: (1100, 800)
@@ -6,3 +6,20 @@ size: (1100, 800)
 assert-property: ("body", {"scrollWidth": "1100"})
 // However, since there is overflow in the type declaration, its scroll width is bigger.
 assert-property: (".item-decl pre", {"scrollWidth": "1324"})
+
+// We now make the same check on type declaration...
+goto: file://|DOC_PATH|/lib2/too_long/type.ReallyLongTypeNameLongLongLong.html
+assert-property: ("body", {"scrollWidth": "1100"})
+// We now check that the section width hasn't grown because of it.
+assert-property: ("#main", {"scrollWidth": "840"})
+// And now checking that it has scrollable content.
+assert-property: (".item-decl pre", {"scrollWidth": "1103"})
+
+// ... and constant.
+// On a sidenote, it also checks that the (very) long title isn't changing the docblock width.
+goto: file://|DOC_PATH|/lib2/too_long/constant.ReallyLongTypeNameLongLongLongConstBecauseWhyNotAConstRightGigaGigaSupraLong.html
+assert-property: ("body", {"scrollWidth": "1100"})
+// We now check that the section width hasn't grown because of it.
+assert-property: ("#main", {"scrollWidth": "840"})
+// And now checking that it has scrollable content.
+assert-property: (".item-decl pre", {"scrollWidth": "950"})