1 files changed, 71 insertions, 0 deletions
diff --git a/compiler/rustc_parse/src/parser/mut_visit/tests.rs b/compiler/rustc_parse/src/parser/mut_visit/tests.rs
new file mode 100644
index 00000000000..b3cb28af657
--- /dev/null
+++ b/compiler/rustc_parse/src/parser/mut_visit/tests.rs
@@ -0,0 +1,71 @@
+use crate::parser::tests::{matches_codepattern, string_to_crate};
+use rustc_ast as ast;
+use rustc_ast::mut_visit::MutVisitor;
+use rustc_ast_pretty::pprust;
+use rustc_span::create_default_session_globals_then;
+use rustc_span::symbol::Ident;
+
+// This version doesn't care about getting comments or doc-strings in.
+fn print_crate_items(krate: &ast::Crate) -> String {
+    krate.items.iter().map(|i| pprust::item_to_string(i)).collect::<Vec<_>>().join(" ")
+}
+
+// Change every identifier to "zz".
+struct ToZzIdentMutVisitor;
+
+impl MutVisitor for ToZzIdentMutVisitor {
+    const VISIT_TOKENS: bool = true;
+
+    fn visit_ident(&mut self, ident: &mut Ident) {
+        *ident = Ident::from_str("zz");
+    }
+}
+
+// Maybe add to `expand.rs`.
+macro_rules! assert_pred {
+    ($pred:expr, $predname:expr, $a:expr , $b:expr) => {{
+        let pred_val = $pred;
+        let a_val = $a;
+        let b_val = $b;
+        if !(pred_val(&a_val, &b_val)) {
+            panic!("expected args satisfying {}, got {} and {}", $predname, a_val, b_val);
+        }
+    }};
+}
+
+// Make sure idents get transformed everywhere.
+#[test]
+fn ident_transformation() {
+    create_default_session_globals_then(|| {
+        let mut zz_visitor = ToZzIdentMutVisitor;
+        let mut krate =
+            string_to_crate("#[a] mod b {fn c (d : e, f : g) {h!(i,j,k);l;m}}".to_string());
+        zz_visitor.visit_crate(&mut krate);
+        assert_pred!(
+            matches_codepattern,
+            "matches_codepattern",
+            print_crate_items(&krate),
+            "#[zz]mod zz{fn zz(zz:zz,zz:zz){zz!(zz,zz,zz);zz;zz}}".to_string()
+        );
+    })
+}
+
+// Make sure idents get transformed even inside macro defs.
+#[test]
+fn ident_transformation_in_defs() {
+    create_default_session_globals_then(|| {
+        let mut zz_visitor = ToZzIdentMutVisitor;
+        let mut krate = string_to_crate(
+            "macro_rules! a {(b $c:expr $(d $e:token)f+ => \
+            (g $(d $d $e)+))} "
+                .to_string(),
+        );
+        zz_visitor.visit_crate(&mut krate);
+        assert_pred!(
+            matches_codepattern,
+            "matches_codepattern",
+            print_crate_items(&krate),
+            "macro_rules! zz{(zz$zz:zz$(zz $zz:zz)zz+=>(zz$(zz$zz$zz)+))}".to_string()
+        );
+    })
+}