Add test for duplicated sidebar entries for reexported macro

src/test/rustdoc-gui/sidebar-macro-reexport.goml

@@ -0,0 +1,5 @@
+// This test ensures that the reexport of a macro doesn't make the original macro
+// displayed twice in the sidebar.
+goto: file://|DOC_PATH|/test_docs/macro.repro.html
+wait-for: ".sidebar-elems .macro .macro"
+assert-count: ("//*[@class='sidebar-elems']//*[@class='block macro']//a[text()='repro']", 1)

src/test/rustdoc-gui/sidebar.goml

@@ -7,12 +7,13 @@ assert-text: (".sidebar-elems > #all-types", "See all test_docs's items")
 assert-text: (".sidebar-elems > .crate > ul > li > a.current", "test_docs")
 // And we're also supposed to have the list of items in the current module.
 assert-text: (".sidebar-elems > .items > ul > li:nth-child(1)", "Modules")
-assert-text: (".sidebar-elems > .items > ul > li:nth-child(2)", "Structs")
-assert-text: (".sidebar-elems > .items > ul > li:nth-child(3)", "Enums")
-assert-text: (".sidebar-elems > .items > ul > li:nth-child(4)", "Traits")
-assert-text: (".sidebar-elems > .items > ul > li:nth-child(5)", "Functions")
-assert-text: (".sidebar-elems > .items > ul > li:nth-child(6)", "Type Definitions")
-assert-text: (".sidebar-elems > .items > ul > li:nth-child(7)", "Keywords")
+assert-text: (".sidebar-elems > .items > ul > li:nth-child(2)", "Macros")
+assert-text: (".sidebar-elems > .items > ul > li:nth-child(3)", "Structs")
+assert-text: (".sidebar-elems > .items > ul > li:nth-child(4)", "Enums")
+assert-text: (".sidebar-elems > .items > ul > li:nth-child(5)", "Traits")
+assert-text: (".sidebar-elems > .items > ul > li:nth-child(6)", "Functions")
+assert-text: (".sidebar-elems > .items > ul > li:nth-child(7)", "Type Definitions")
+assert-text: (".sidebar-elems > .items > ul > li:nth-child(8)", "Keywords")
 assert-text: ("#structs + .item-table .item-left > a", "Foo")
 click: "#structs + .item-table .item-left > a"
 

src/test/rustdoc-gui/src/test_docs/lib.rs

@@ -123,3 +123,10 @@ pub mod huge_amount_of_consts {
 
 /// Very long code text `hereIgoWithLongTextBecauseWhyNotAndWhyWouldntI`.
 pub mod long_code_block {}
+
+#[macro_export]
+macro_rules! repro {
+    () => {};
+}
+
+pub use crate::repro as repro2;