ast: Remove token visiting from AST visitor

It's no longer necessary after the removal of nonterminal tokens in #124141.

compiler/rustc_parse/src/parser/mod.rs

@@ -56,10 +56,6 @@ mod tests;
 mod tokenstream {
     mod tests;
 }
-#[cfg(test)]
-mod mut_visit {
-    mod tests;
-}
 
 bitflags::bitflags! {
     #[derive(Clone, Copy, Debug)]

compiler/rustc_parse/src/parser/mut_visit/tests.rs

@@ -1,65 +0,0 @@
-use rustc_ast as ast;
-use rustc_ast::mut_visit::MutVisitor;
-use rustc_ast_pretty::pprust;
-use rustc_span::{Ident, create_default_session_globals_then};
-
-use crate::parser::tests::{matches_codepattern, string_to_crate};
-
-// 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");
-    }
-}
-
-macro_rules! assert_matches_codepattern {
-    ($a:expr , $b:expr) => {{
-        let a_val = $a;
-        let b_val = $b;
-        if !matches_codepattern(&a_val, &b_val) {
-            panic!("expected args satisfying `matches_codepattern`, got {} and {}", 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_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 $e)+))} "
-                .to_string(),
-        );
-        zz_visitor.visit_crate(&mut krate);
-        assert_matches_codepattern!(
-            print_crate_items(&krate),
-            "macro_rules! zz{(zz$zz:zz$(zz $zz:zz)zz+=>(zz$(zz$zz$zz)+))}".to_string()
-        );
-    })
-}

compiler/rustc_parse/src/parser/tests.rs

@@ -95,12 +95,6 @@ pub(crate) fn string_to_stream(source_str: String) -> TokenStream {
     ))
 }
 
-/// Parses a string, returns a crate.
-pub(crate) fn string_to_crate(source_str: String) -> ast::Crate {
-    let psess = psess();
-    with_error_checking_parse(source_str, &psess, |p| p.parse_crate_mod())
-}
-
 /// Does the given string match the pattern? whitespace in the first string
 /// may be deleted or replaced with other whitespace to match the pattern.
 /// This function is relatively Unicode-ignorant; fortunately, the careful design