remove some known-bug that do not seem to make sense

Author: RalfJung

tests/ui/consts/const-block-const-bound.rs

@@ -1,5 +1,3 @@
-//@ known-bug: #103507
-
 #![allow(unused)]
 #![feature(const_trait_impl, negative_impls, const_destruct)]
 
@@ -16,6 +14,6 @@ impl Drop for UnconstDrop {
 fn main() {
     const {
         f(UnconstDrop);
-        //FIXME ~^ ERROR can't drop
+        //~^ ERROR trait bound `UnconstDrop: const Destruct` is not satisfied
     }
 }

tests/ui/consts/const-block-const-bound.stderr

@@ -1,13 +1,13 @@
 error[E0277]: the trait bound `UnconstDrop: const Destruct` is not satisfied
-  --> $DIR/const-block-const-bound.rs:18:11
+  --> $DIR/const-block-const-bound.rs:16:11
    |
 LL |         f(UnconstDrop);
    |         - ^^^^^^^^^^^
    |         |
    |         required by a bound introduced by this call
    |
 note: required by a bound in `f`
-  --> $DIR/const-block-const-bound.rs:8:15
+  --> $DIR/const-block-const-bound.rs:6:15
    |
 LL | const fn f<T: ~const Destruct>(x: T) {}
    |               ^^^^^^ required by this bound in `f`

tests/ui/consts/issue-94675.rs

@@ -1,5 +1,3 @@
-//@ known-bug: #103507
-
 #![feature(const_trait_impl, const_vec_string_slice)]
 
 struct Foo<'a> {
@@ -9,9 +7,7 @@ struct Foo<'a> {
 impl<'a> Foo<'a> {
     const fn spam(&mut self, baz: &mut Vec<u32>) {
         self.bar[0] = baz.len();
-        //FIXME ~^ ERROR: cannot call
-        //FIXME ~| ERROR: cannot call
-        //FIXME ~| ERROR: the trait bound
+        //~^ ERROR: cannot call
     }
 }
 

tests/ui/consts/issue-94675.stderr

@@ -1,5 +1,5 @@
 error[E0015]: cannot call non-const operator in constant functions
-  --> $DIR/issue-94675.rs:11:17
+  --> $DIR/issue-94675.rs:9:17
    |
 LL |         self.bar[0] = baz.len();
    |                 ^^^