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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-17 12:19:13 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-17 12:19:13 +0000
commit218caa410aa38c29984be31a5229b9fa717560ee (patch)
treec54bd55eeb6e4c508940a30e94c0032fbd45d677 /tests/ui/macros/macro-at-most-once-rep-2018-rpass.rs
parentReleasing progress-linux version 1.67.1+dfsg1-1~progress7.99u1. (diff)
downloadrustc-218caa410aa38c29984be31a5229b9fa717560ee.tar.xz
rustc-218caa410aa38c29984be31a5229b9fa717560ee.zip
Merging upstream version 1.68.2+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/ui/macros/macro-at-most-once-rep-2018-rpass.rs')
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diff --git a/tests/ui/macros/macro-at-most-once-rep-2018-rpass.rs b/tests/ui/macros/macro-at-most-once-rep-2018-rpass.rs
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+// run-pass
+
+#![allow(unused_mut)]
+
+// Check that when `?` is followed by what looks like a Kleene operator (?, +, and *)
+// then that `?` is not interpreted as a separator. In other words, `$(pat)?+` matches `pat +`
+// or `+` but does not match `pat` or `pat ? pat`.
+
+// edition:2018
+
+macro_rules! foo {
+ // Check for `?`.
+ ($($a:ident)? ? $num:expr) => {
+ foo!($($a)? ; $num);
+ };
+ // Check for `+`.
+ ($($a:ident)? + $num:expr) => {
+ foo!($($a)? ; $num);
+ };
+ // Check for `*`.
+ ($($a:ident)? * $num:expr) => {
+ foo!($($a)? ; $num);
+ };
+ // Check for `;`, not a kleene operator.
+ ($($a:ident)? ; $num:expr) => {
+ let mut x = 0;
+
+ $(
+ x += $a;
+ )?
+
+ assert_eq!(x, $num);
+ };
+}
+
+pub fn main() {
+ let a = 1;
+
+ // Accept 0 repetitions.
+ foo!( ; 0);
+ foo!( + 0);
+ foo!( * 0);
+ foo!( ? 0);
+
+ // Accept 1 repetition.
+ foo!(a ; 1);
+ foo!(a + 1);
+ foo!(a * 1);
+ foo!(a ? 1);
+}