Add test for macro support in "jump to def" feature

src/test/rustdoc/check-source-code-urls-to-def-std.rs

@@ -15,3 +15,28 @@ pub fn foo(a: u32, b: &str, c: String) {
     let y: bool = true;
     babar();
 }
+
+macro_rules! yolo { () => {}}
+
+fn bar(a: i32) {}
+
+macro_rules! bar {
+    ($a:ident) => { bar($a) }
+}
+
+macro_rules! data {
+    ($x:expr) => { $x * 2 }
+}
+
+pub fn another_foo() {
+    // This is known limitation: if the macro doesn't generate anything, the visitor
+    // can't find any item or anything that could tell us that it comes from expansion.
+    // @!has - '//a[@href="../../src/foo/check-source-code-urls-to-def-std.rs.html#19"]' 'yolo!'
+    yolo!();
+    // @has - '//a[@href="{{channel}}/std/macro.eprintln.html"]' 'eprintln!'
+    eprintln!();
+    // @has - '//a[@href="../../src/foo/check-source-code-urls-to-def-std.rs.html#27-29"]' 'data!'
+    let x = data!(4);
+    // @has - '//a[@href="../../src/foo/check-source-code-urls-to-def-std.rs.html#23-25"]' 'bar!'
+    bar!(x);
+}