1 files changed, 59 insertions, 0 deletions
diff --git a/tests/ui/wf/wf-static-method.rs b/tests/ui/wf/wf-static-method.rs
new file mode 100644
index 000000000..7ff195230
--- /dev/null
+++ b/tests/ui/wf/wf-static-method.rs
@@ -0,0 +1,59 @@
+// check that static methods don't get to assume their trait-ref
+// is well-formed.
+// FIXME(#27579): this is just a bug. However, our checking with
+// static inherent methods isn't quite working - need to
+// fix that before removing the check.
+
+trait Foo<'a, 'b, T>: Sized {
+    fn make_me() -> Self { loop {} }
+    fn static_evil(u: &'b u32) -> &'a u32;
+}
+
+struct Evil<'a, 'b: 'a>(Option<&'a &'b ()>);
+
+impl<'a, 'b> Foo<'a, 'b, Evil<'a, 'b>> for () {
+    fn make_me() -> Self { }
+    fn static_evil(u: &'b u32) -> &'a u32 {
+        u
+        //~^ ERROR lifetime may not live long enough
+    }
+}
+
+struct IndirectEvil<'a, 'b: 'a>(Option<&'a &'b ()>);
+
+impl<'a, 'b> Foo<'a, 'b, ()> for IndirectEvil<'a, 'b> {
+    fn make_me() -> Self { IndirectEvil(None) }
+    fn static_evil(u: &'b u32) -> &'a u32 {
+        let me = Self::make_me();
+        //~^ ERROR lifetime may not live long enough
+        loop {} // (`me` could be used for the lifetime transmute).
+    }
+}
+
+impl<'a, 'b> Evil<'a, 'b> {
+    fn inherent_evil(u: &'b u32) -> &'a u32 {
+        u
+        //~^ ERROR lifetime may not live long enough
+    }
+}
+
+// while static methods don't get to *assume* this, we still
+// *check* that they hold.
+
+fn evil<'a, 'b>(b: &'b u32) -> &'a u32 {
+    <()>::static_evil(b)
+    //~^ ERROR lifetime may not live long enough
+}
+
+fn indirect_evil<'a, 'b>(b: &'b u32) -> &'a u32 {
+    <IndirectEvil>::static_evil(b)
+    //~^ ERROR lifetime may not live long enough
+}
+
+fn inherent_evil<'a, 'b>(b: &'b u32) -> &'a u32 {
+    <Evil>::inherent_evil(b)
+    //~^ ERROR lifetime may not live long enough
+}
+
+
+fn main() {}