Update tests since ? macro op is supported on 2015.

src/test/run-pass/macros/macro-at-most-once-rep-2015.rs

@@ -0,0 +1,33 @@
+// run-pass
+#![allow(unused_mut)]
+// The logic for parsing Kleene operators in macros has a special case to disambiguate `?`.
+// Specifically, `$(pat)?` is the ZeroOrOne operator whereas `$(pat)?+` or `$(pat)?*` are the
+// ZeroOrMore and OneOrMore operators using `?` as a separator. These tests are intended to
+// exercise that logic in the macro parser.
+//
+// Moreover, we also throw in some tests for using a separator with `?`, which is meaningless but
+// included for consistency with `+` and `*`.
+//
+// This test focuses on non-error cases and making sure the correct number of repetitions happen.
+
+// edition:2015
+
+macro_rules! foo {
+    ($($a:ident)? ; $num:expr) => { {
+        let mut x = 0;
+
+        $(
+            x += $a;
+         )?
+
+        assert_eq!(x, $num);
+    } }
+}
+
+pub fn main() {
+    let a = 1;
+
+    // accept 0 or 1 repetitions
+    foo!( ; 0);
+    foo!(a ; 1);
+}

src/test/ui/issues/issue-39388.rs

@@ -1,7 +1,7 @@
 #![allow(unused_macros)]
 
 macro_rules! assign {
-    (($($a:tt)*) = ($($b:tt))*) => { //~ ERROR expected `*` or `+`
+    (($($a:tt)*) = ($($b:tt))*) => { //~ ERROR expected one of: `*`, `+`, or `?`
         $($a)* = $($b)*
     }
 }

src/test/ui/issues/issue-39388.stderr

@@ -1,4 +1,4 @@
-error: expected `*` or `+`
+error: expected one of: `*`, `+`, or `?`
   --> $DIR/issue-39388.rs:4:22
    |
 LL |     (($($a:tt)*) = ($($b:tt))*) => {

src/test/ui/macros/macro-at-most-once-rep-2015.rs

@@ -0,0 +1,41 @@
+// Tests that `?` is a Kleene op and not a macro separator in the 2015 edition.
+
+// edition:2015
+
+macro_rules! foo {
+    ($(a)?) => {};
+}
+
+macro_rules! baz {
+    ($(a),?) => {}; //~ERROR the `?` macro repetition operator
+}
+
+macro_rules! barplus {
+    ($(a)?+) => {}; // ok. matches "a+" and "+"
+}
+
+macro_rules! barstar {
+    ($(a)?*) => {}; // ok. matches "a*" and "*"
+}
+
+pub fn main() {
+    foo!();
+    foo!(a);
+    foo!(a?); //~ ERROR no rules expected the token `?`
+    foo!(a?a); //~ ERROR no rules expected the token `?`
+    foo!(a?a?a); //~ ERROR no rules expected the token `?`
+
+    barplus!(); //~ERROR unexpected end of macro invocation
+    barplus!(a); //~ERROR unexpected end of macro invocation
+    barplus!(a?); //~ ERROR no rules expected the token `?`
+    barplus!(a?a); //~ ERROR no rules expected the token `?`
+    barplus!(a+);
+    barplus!(+);
+
+    barstar!(); //~ERROR unexpected end of macro invocation
+    barstar!(a); //~ERROR unexpected end of macro invocation
+    barstar!(a?); //~ ERROR no rules expected the token `?`
+    barstar!(a?a); //~ ERROR no rules expected the token `?`
+    barstar!(a*);
+    barstar!(*);
+}

src/test/ui/macros/macro-at-most-once-rep-2015.stderr

@@ -0,0 +1,107 @@
+error: the `?` macro repetition operator does not take a separator
+  --> $DIR/macro-at-most-once-rep-2015.rs:10:10
+   |
+LL |     ($(a),?) => {};
+   |          ^
+
+error: no rules expected the token `?`
+  --> $DIR/macro-at-most-once-rep-2015.rs:24:11
+   |
+LL | macro_rules! foo {
+   | ---------------- when calling this macro
+...
+LL |     foo!(a?);
+   |           ^ no rules expected this token in macro call
+
+error: no rules expected the token `?`
+  --> $DIR/macro-at-most-once-rep-2015.rs:25:11
+   |
+LL | macro_rules! foo {
+   | ---------------- when calling this macro
+...
+LL |     foo!(a?a);
+   |           ^ no rules expected this token in macro call
+
+error: no rules expected the token `?`
+  --> $DIR/macro-at-most-once-rep-2015.rs:26:11
+   |
+LL | macro_rules! foo {
+   | ---------------- when calling this macro
+...
+LL |     foo!(a?a?a);
+   |           ^ no rules expected this token in macro call
+
+error: unexpected end of macro invocation
+  --> $DIR/macro-at-most-once-rep-2015.rs:28:5
+   |
+LL | macro_rules! barplus {
+   | -------------------- when calling this macro
+...
+LL |     barplus!();
+   |     ^^^^^^^^^^^ missing tokens in macro arguments
+
+error: unexpected end of macro invocation
+  --> $DIR/macro-at-most-once-rep-2015.rs:29:15
+   |
+LL | macro_rules! barplus {
+   | -------------------- when calling this macro
+...
+LL |     barplus!(a);
+   |               ^ missing tokens in macro arguments
+
+error: no rules expected the token `?`
+  --> $DIR/macro-at-most-once-rep-2015.rs:30:15
+   |
+LL | macro_rules! barplus {
+   | -------------------- when calling this macro
+...
+LL |     barplus!(a?);
+   |               ^ no rules expected this token in macro call
+
+error: no rules expected the token `?`
+  --> $DIR/macro-at-most-once-rep-2015.rs:31:15
+   |
+LL | macro_rules! barplus {
+   | -------------------- when calling this macro
+...
+LL |     barplus!(a?a);
+   |               ^ no rules expected this token in macro call
+
+error: unexpected end of macro invocation
+  --> $DIR/macro-at-most-once-rep-2015.rs:35:5
+   |
+LL | macro_rules! barstar {
+   | -------------------- when calling this macro
+...
+LL |     barstar!();
+   |     ^^^^^^^^^^^ missing tokens in macro arguments
+
+error: unexpected end of macro invocation
+  --> $DIR/macro-at-most-once-rep-2015.rs:36:15
+   |
+LL | macro_rules! barstar {
+   | -------------------- when calling this macro
+...
+LL |     barstar!(a);
+   |               ^ missing tokens in macro arguments
+
+error: no rules expected the token `?`
+  --> $DIR/macro-at-most-once-rep-2015.rs:37:15
+   |
+LL | macro_rules! barstar {
+   | -------------------- when calling this macro
+...
+LL |     barstar!(a?);
+   |               ^ no rules expected this token in macro call
+
+error: no rules expected the token `?`
+  --> $DIR/macro-at-most-once-rep-2015.rs:38:15
+   |
+LL | macro_rules! barstar {
+   | -------------------- when calling this macro
+...
+LL |     barstar!(a?a);
+   |               ^ no rules expected this token in macro call
+
+error: aborting due to 12 previous errors
+

src/test/ui/parser/macro/issue-33569.rs

@@ -1,7 +1,7 @@
 macro_rules! foo {
     { $+ } => { //~ ERROR expected identifier, found `+`
                 //~^ ERROR missing fragment specifier
-        $(x)(y) //~ ERROR expected `*` or `+`
+        $(x)(y) //~ ERROR expected one of: `*`, `+`, or `?`
     }
 }
 

src/test/ui/parser/macro/issue-33569.stderr

@@ -4,7 +4,7 @@ error: expected identifier, found `+`
 LL |     { $+ } => {
    |        ^
 
-error: expected `*` or `+`
+error: expected one of: `*`, `+`, or `?`
   --> $DIR/issue-33569.rs:4:13
    |
 LL |         $(x)(y)