Rollup merge of #78118 - spastorino:inline-const-followups, r=petrochenkov

Inline const followups

r? @petrochenkov

Follow ups of #77124

compiler/rustc_hir_pretty/src/lib.rs

@@ -1138,9 +1138,7 @@ fn print_expr_vec(&mut self, exprs: &[hir::Expr<'_>]) {
     fn print_expr_anon_const(&mut self, anon_const: &hir::AnonConst) {
         self.ibox(INDENT_UNIT);
         self.s.word_space("const");
-        self.s.word("{");
         self.print_anon_const(anon_const);
-        self.s.word("}");
         self.end()
     }
 

compiler/rustc_parse/src/parser/mod.rs

@@ -548,7 +548,11 @@ fn check_const_arg(&mut self) -> bool {
 
     fn check_inline_const(&mut self) -> bool {
         self.check_keyword(kw::Const)
-            && self.look_ahead(1, |t| t == &token::OpenDelim(DelimToken::Brace))
+            && self.look_ahead(1, |t| match t.kind {
+                token::Interpolated(ref nt) => matches!(**nt, token::NtBlock(..)),
+                token::OpenDelim(DelimToken::Brace) => true,
+                _ => false,
+            })
     }
 
     /// Checks to see if the next token is either `+` or `+=`.

src/test/ui/inline-const/const-expr-macro.rs

@@ -0,0 +1,12 @@
+// run-pass
+
+#![allow(incomplete_features)]
+#![feature(inline_const)]
+macro_rules! do_const_block{
+    ($val:block) => { const $val }
+}
+
+fn main() {
+    let s = do_const_block!({ 22 });
+    assert_eq!(s, 22);
+}