Rollup merge of #51059 - oberien:patch-1, r=nikomatsakis

What does an expression look like, that consists only of special characters?

I had a lot of fun creating this together with @CryZe

Author: kennytm

src/test/run-pass/weird-exprs.rs

@@ -112,6 +112,12 @@ fn union() {
     union union<'union> { union: &'union union<'union>, }
 }
 
+fn special_characters() {
+    let val = !((|(..):(_,_),__@_|__)((&*"\\",'🤔')/**/,{})=={&[..=..][..];})//
+    ;
+    assert!(!val);
+}
+
 pub fn main() {
     strange();
     funny();
@@ -125,4 +131,5 @@ pub fn main() {
     you_eight();
     fishy();
     union();
+    special_characters();
 }