rustc_ast_pretty: Don't print space after $

For example, this code:

    $arg:expr

used to be pretty-printed as:

    $ arg : expr

but is now pretty-printed as:

    $arg : expr

compiler/rustc_ast_pretty/src/pprust/state.rs

@@ -136,11 +136,11 @@ pub fn print_crate<'a>(
     s.s.eof()
 }
 
-// This makes printed token streams look slightly nicer,
+/// This makes printed token streams look slightly nicer,
-// and also addresses some specific regressions described in #63896 and #73345.
+/// and also addresses some specific regressions described in #63896 and #73345.
 fn tt_prepend_space(tt: &TokenTree, prev: &TokenTree) -> bool {
     if let TokenTree::Token(token) = prev {
-        if matches!(token.kind, token::Dot) {
+        if matches!(token.kind, token::Dot | token::Dollar) {
             return false;
         }
         if let token::DocComment(comment_kind, ..) = token.kind {

src/test/pretty/macro_rules.rs

@@ -11,9 +11,9 @@ macro_rules! matcher_brackets {
 }
 
 macro_rules! all_fragments {
-    ($ b : block, $ e : expr, $ i : ident, $ it : item, $ l : lifetime, $ lit
+    ($b : block, $e : expr, $i : ident, $it : item, $l : lifetime, $lit :
-     : literal, $ m : meta, $ p : pat, $ pth : path, $ s : stmt, $ tt : tt, $
+     literal, $m : meta, $p : pat, $pth : path, $s : stmt, $tt : tt, $ty : ty,
-     ty : ty, $ vis : vis) => { } ;
+     $vis : vis) => { } ;
 }
 
 fn main() { }

src/test/rustdoc/macro_rules-matchers.rs

@@ -14,10 +14,12 @@
 // @has - '//span[@class="op"]' '>'
 // @has - '{ ... };'
 
-// @has - '($ ($'
+// @has - '($('
-// @has - '//span[@class="ident"]' 'arg'
+// @has - '//span[@class="macro-nonterminal"]' '$'
+// @has - '//span[@class="macro-nonterminal"]' 'arg'
 // @has - ':'
 // @has - '//span[@class="ident"]' 'tt'
+// @has - '),'
 // @has - '//span[@class="op"]' '+'
 // @has - ')'
 pub use std::todo;
@@ -28,9 +30,11 @@ mod mod1 {
     // @has - 'macro1'
     // @has - '{ ()'
     // @has - '($('
-    // @has - 'arg'
+    // @has - '//span[@class="macro-nonterminal"]' '$'
+    // @has - '//span[@class="macro-nonterminal"]' 'arg'
+    // @has - ':'
     // @has - 'expr'
-    // @has - ','
+    // @has - '),'
     // @has - '+'
     // @has - ')'
     #[macro_export]