diff --git a/rust/examples/bench.rs b/rust/examples/bench.rs
index 12d1282..4153a75 100644
--- a/rust/examples/bench.rs
+++ b/rust/examples/bench.rs
@@ -11,13 +11,13 @@ use std::hint::black_box;
 use std::sync::{Arc, RwLock};
 use std::time::{Duration, Instant};
 
-fn bench(name: &str, mut f: impl FnMut(u64)) {
-    f(0);
+fn bench<R>(name: &str, mut f: impl FnMut(u64) -> R) {
+    black_box(f(0));
     let budget = Duration::from_secs(2);
     let start = Instant::now();
     let mut n = 0u64;
     while start.elapsed() < budget {
-        f(n);
+        black_box(f(n));
         n += 1;
     }
     let per = start.elapsed() / n as u32;
diff --git a/rust/src/lib.rs b/rust/src/lib.rs
index d084006..2a8cf38 100644
--- a/rust/src/lib.rs
+++ b/rust/src/lib.rs
@@ -1,5 +1,6 @@
 //! mapsize: interactive terminal disk usage analyser (Rust port).
 
+pub mod app;
 pub mod brand;
 pub mod cancel;
 pub mod config;
diff --git a/rust/src/tui/infoview.rs b/rust/src/tui/infoview.rs
index 14c1d11..6a5a858 100644
--- a/rust/src/tui/infoview.rs
+++ b/rust/src/tui/infoview.rs
@@ -3,7 +3,7 @@
 use super::canvas::{Canvas, Style, BOLD};
 use super::model::{Cmd, Model};
 use super::table::{col, Table, TableRow};
-use super::{san, si_units};
+use super::san;
 use crate::inventory::{ErrKind, Tree, FLAG_ALLOC_UNKNOWN};
 use crate::textutil;
 use crate::treemap::Rect;
@@ -107,7 +107,7 @@ impl InfoView {
         line(cv, &mut y, "One filesystem", &st.one_file_system.to_string(), value);
         line(cv, &mut y, "Follow symlinks", &textutil::sanitize(&st.follow), value);
         line(cv, &mut y, "Size mode", m.size_mode.name(), value);
-        line(cv, &mut y, "Units", if si_units() { "SI (1000)" } else { "IEC (1024)" }, value);
+        line(cv, &mut y, "Units", if crate::textutil::si() { "SI (1000)" } else { "IEC (1024)" }, value);
         if root.has(FLAG_ALLOC_UNKNOWN) {
             line(cv, &mut y, "Note", "allocated size unavailable on this platform", Style::new(t.warn, t.bg));
         }
diff --git a/rust/src/tui/mod.rs b/rust/src/tui/mod.rs
index 0703e7f..f923945 100644
--- a/rust/src/tui/mod.rs
+++ b/rust/src/tui/mod.rs
@@ -55,11 +55,6 @@ pub(crate) fn san(b: &[u8]) -> String {
     textutil::sanitize_bytes(b)
 }
 
-/// Whether decimal (SI) units are selected. textutil keeps the switch
-/// private, so it is inferred from the formatting.
-pub(crate) fn si_units() -> bool {
-    textutil::size(1000).ends_with("kB")
-}
 
 fn local_tm(unix_nanos: i64) -> libc::tm {
     let secs = unix_nanos.div_euclid(1_000_000_000) as libc::time_t;
diff --git a/rust/src/tui/modals.rs b/rust/src/tui/modals.rs
index 22c7a25..48de42b 100644
--- a/rust/src/tui/modals.rs
+++ b/rust/src/tui/modals.rs
@@ -7,7 +7,7 @@ use super::mapview::Group;
 use super::modal::{kv, styled, txt, wrap, Line, Modal, Span};
 use super::model::{Cmd, Model};
 use super::search::LineEditor;
-use super::{fmt_time, pad_left, pad_right, san, si_units, trunc, tw};
+use super::{fmt_time, pad_left, pad_right, san, trunc, tw};
 use crate::export;
 use crate::filter;
 use crate::inventory::{NodeId, Tree, FLAG_ALLOC_UNKNOWN, FLAG_HARDLINK_DUP, FLAG_INCOMPLETE, FLAG_LOOP, FLAG_SCANNED, FLAG_SKIPPED_FS, FLAG_SPARSE, FLAG_VIRTUAL_FS, NO_NODE};
@@ -321,7 +321,7 @@ impl Modal for HelpModal {
         row(&mut out, "Ctrl+C", "cancel scan; press again to quit");
         row(&mut out, "q", "quit");
         out.push(txt(""));
-        let units = if si_units() { "SI (kB = 1000 bytes)" } else { "IEC (KiB = 1024 bytes)" };
+        let units = if crate::textutil::si() { "SI (kB = 1000 bytes)" } else { "IEC (KiB = 1024 bytes)" };
         out.push(styled(format!("Sizes: {} · units: {units}", m.size_mode.name()), muted));
         out
     }