move lint tests into subdirectories

tests/rustdoc-ui/lints/doc-without-codeblock.rs

@@ -0,0 +1,23 @@
+#![feature(rustdoc_missing_doc_code_examples)] //~ ERROR missing code example in this documentation
+#![deny(rustdoc::missing_doc_code_examples)]
+
+/// Some docs.
+//~^ ERROR missing code example in this documentation
+pub struct Foo;
+
+/// And then, the princess died.
+//~^ ERROR missing code example in this documentation
+pub mod foo {
+    /// Or maybe not because she saved herself!
+    //~^ ERROR missing code example in this documentation
+    pub fn bar() {}
+}
+
+// This impl is here to ensure the lint isn't emitted for foreign traits implementations.
+impl std::ops::Neg for Foo {
+    type Output = Self;
+
+    fn neg(self) -> Self::Output {
+        Self
+    }
+}