Rollup merge of #70768 - petrochenkov:macambig, r=Centril,mark-i-m

macro_rules: `NtLifetime` cannot start with an identifier

Fixes https://github.com/rust-lang/rust/issues/70446

src/test/ui/macros/issue-70446.rs

@@ -0,0 +1,13 @@
+// check-pass
+
+macro_rules! foo {
+    ($(: $p:path)? $(: $l:lifetime)? ) => { bar! {$(: $p)? $(: $l)? } };
+}
+
+macro_rules! bar {
+    ($(: $p:path)? $(: $l:lifetime)? ) => {};
+}
+
+foo! {: 'a }
+
+fn main() {}