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diff --git a/tests/ui/or-patterns/or-patterns-syntactic-pass.rs b/tests/ui/or-patterns/or-patterns-syntactic-pass.rs
new file mode 100644
index 00000000000..92750bec8b2
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+++ b/tests/ui/or-patterns/or-patterns-syntactic-pass.rs
@@ -0,0 +1,78 @@
+// Here we test all the places `|` is *syntactically* allowed.
+// This is not a semantic test. We only test parsing.
+
+// check-pass
+
+fn main() {}
+
+// Test the `pat` macro fragment parser:
+macro_rules! accept_pat {
+    ($p:pat) => {};
+}
+
+accept_pat!((p | q));
+accept_pat!((p | q,));
+accept_pat!(TS(p | q));
+accept_pat!(NS { f: p | q });
+accept_pat!([p | q]);
+
+// Non-macro tests:
+
+#[cfg(FALSE)]
+fn or_patterns() {
+    // Top level of `let`:
+    let (| A | B);
+    let (A | B);
+    let (A | B): u8;
+    let (A | B) = 0;
+    let (A | B): u8 = 0;
+
+    // Top level of `for`:
+    for | A | B in 0 {}
+    for A | B in 0 {}
+
+    // Top level of `while`:
+    while let | A | B = 0 {}
+    while let A | B = 0 {}
+
+    // Top level of `if`:
+    if let | A | B = 0 {}
+    if let A | B = 0 {}
+
+    // Top level of `match` arms:
+    match 0 {
+        | A | B => {}
+        A | B => {}
+    }
+
+    // Functions:
+    fn fun((A | B): _) {}
+
+    // Lambdas:
+    let _ = |(A | B): u8| ();
+
+    // Parenthesis and tuple patterns:
+    let (A | B);
+    let (A | B,);
+
+    // Tuple struct patterns:
+    let A(B | C);
+    let E::V(B | C);
+
+    // Struct patterns:
+    let S { f1: B | C, f2 };
+    let E::V { f1: B | C, f2 };
+
+    // Slice patterns:
+    let [A | B, .. | ..];
+
+    // These bind as `(prefix p) | q` as opposed to `prefix (p | q)`:
+    let (box 0 | 1); // Unstable; we *can* change the precedence if we want.
+                     //~^ WARN box pattern syntax is experimental
+                     //~| WARN unstable syntax
+    let (&0 | 1);
+    let (&mut 0 | 1);
+    let (x @ 0 | 1);
+    let (ref x @ 0 | 1);
+    let (ref mut x @ 0 | 1);
+}