[v6.d REVIEW] Throw out is equiv test

Don't want to spec this behaviour until RT#131099 [^1] and
behaviour in related tickets[^2] are entirely resolved/specced

[1] https://rt.perl.org/Public/Bug/Display.html?id=131099
[2] RT#132713, RT#132710, RT#132711, maybe more
    https://rt.perl.org/Public/Bug/Display.html?id=132713
    https://rt.perl.org/Public/Bug/Display.html?id=132710
    https://rt.perl.org/Public/Bug/Display.html?id=132711

S06-traits/precedence.t

@@ -10,7 +10,7 @@ Tests for precedence of self defined operators
 
 # L<S06/Subroutine traits/"relative to an existing">
 
-plan 16;
+plan 15;
 
 do {
     sub prefix:<!> (Int $x) is tighter(&infix:<**>) {
@@ -112,11 +112,4 @@ do {
     dies-ok( { EVAL '4 !' },  "Whitespace not allowed before user-defined postfix");
 }
 
-# RT#131099
-lives-ok {
-    sub postfix:<♥> ($) is equiv(&[orelse]) {};
-    42♥;
-    &postfix:<♥>.prec<assoc> and die "Must not have assoc set!";
-}, '`is equiv` does not copy .prec<assoc>';
-
 # vim: ft=perl6