Ignore test hrtb/issue-30786.rs in Polonius compare mode

Author: lqd

src/test/ui/hrtb/issue-30786.migrate.stderr

@@ -1,11 +1,11 @@
 error: implementation of `Stream` is not general enough
-  --> $DIR/issue-30786.rs:107:22
+  --> $DIR/issue-30786.rs:108:22
    |
 LL |     let map = source.map(|x: &_| x);
    |                      ^^^
    |
-   = note: `Stream` would have to be implemented for the type `&'0 mut Map<Repeat, [closure@$DIR/issue-30786.rs:107:26: 107:35]>`, for any lifetime `'0`
-   = note: but `Stream` is actually implemented for the type `&'1 mut Map<Repeat, [closure@$DIR/issue-30786.rs:107:26: 107:35]>`, for some specific lifetime `'1`
+   = note: `Stream` would have to be implemented for the type `&'0 mut Map<Repeat, [closure@$DIR/issue-30786.rs:108:26: 108:35]>`, for any lifetime `'0`
+   = note: but `Stream` is actually implemented for the type `&'1 mut Map<Repeat, [closure@$DIR/issue-30786.rs:108:26: 108:35]>`, for some specific lifetime `'1`
 
 error: aborting due to previous error
 

src/test/ui/hrtb/issue-30786.nll.stderr

@@ -1,11 +1,11 @@
 error: higher-ranked subtype error
-  --> $DIR/issue-30786.rs:111:18
+  --> $DIR/issue-30786.rs:112:18
    |
 LL |     let filter = map.filter(|x: &_| true);
    |                  ^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: higher-ranked subtype error
-  --> $DIR/issue-30786.rs:113:17
+  --> $DIR/issue-30786.rs:114:17
    |
 LL |     let count = filter.count(); // Assert that we still have a valid stream.
    |                 ^^^^^^^^^^^^^^

src/test/ui/hrtb/issue-30786.rs

@@ -12,6 +12,7 @@
 // revisions, don't worry about the --compare-mode=nll on this test.
 
 // ignore-compare-mode-nll
+// ignore-compare-mode-polonius
 
 //[nll]compile-flags: -Z borrowck=mir