Silence unused imports for backports

Would be cool if there was a way to do this on future:: in general.

src/bin/fish_indent.rs

@@ -30,6 +30,7 @@
 use fish::expand::INTERNAL_SEPARATOR;
 use fish::fds::set_cloexec;
 use fish::fprintf;
+#[allow(unused_imports)]
 use fish::future::{IsSomeAnd, IsSorted};
 use fish::global_safety::RelaxedAtomicBool;
 use fish::highlight::{colorize, highlight_shell, HighlightRole, HighlightSpec};

src/editable_line.rs

@@ -1,3 +1,4 @@
+#[allow(unused_imports)]
 use crate::future::IsSomeAnd;
 use crate::highlight::HighlightSpec;
 use crate::wchar::prelude::*;

src/screen.rs

@@ -27,6 +27,7 @@
 use crate::env::{Environment, TERM_HAS_XN};
 use crate::fallback::fish_wcwidth;
 use crate::flog::FLOGF;
+#[allow(unused_imports)]
 use crate::future::IsSomeAnd;
 use crate::global_safety::RelaxedAtomicBool;
 use crate::highlight::HighlightColorResolver;