Parse fully-qualified associated types in generics without whitespace

This breaks code that looks like this:

    let x = foo as bar << 13;

Change such code to look like this:

    let x = (foo as bar) << 13;

Closes #17362.

[breaking-change]

1 files changed, 2 insertions, 2 deletions

diff --git a/src/libstd/io/net/ip.rs b/src/libstd/io/net/ip.rs
index add986387da..83be9574f78 100644
--- a/src/libstd/io/net/ip.rs
+++ b/src/libstd/io/net/ip.rs
@@ -267,8 +267,8 @@ impl<'a> Parser<'a> {
                     });
                     match ipv4 {
                         Some(Ipv4Addr(a, b, c, d)) => {
-                            groups[i + 0] = (a as u16 << 8) | (b as u16);
-                            groups[i + 1] = (c as u16 << 8) | (d as u16);
+                            groups[i + 0] = ((a as u16) << 8) | (b as u16);
+                            groups[i + 1] = ((c as u16) << 8) | (d as u16);
                             return (i + 2, true);
                         }
                         _ => {}