From da8e30296b7c552e7864407da53d996e7af10687 Mon Sep 17 00:00:00 2001
From: SLUCHABLUB <81807027+SLUCHABLUB@users.noreply.github.com>
Date: Wed, 4 Jun 2025 10:54:34 +0200
Subject: [PATCH] Fix an incorrect error message regarding the size of `usize`.

---
 clippy_lints/src/casts/cast_precision_loss.rs | 3 +--
 tests/ui/cast_size.32bit.stderr               | 4 ++--
 tests/ui/cast_size.64bit.stderr               | 4 ++--
 3 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/clippy_lints/src/casts/cast_precision_loss.rs b/clippy_lints/src/casts/cast_precision_loss.rs
index 712e38db499f..d0786fd2f1be 100644
--- a/clippy_lints/src/casts/cast_precision_loss.rs
+++ b/clippy_lints/src/casts/cast_precision_loss.rs
@@ -28,8 +28,7 @@ pub(super) fn check(cx: &LateContext<'_>, expr: &Expr<'_>, cast_from: Ty<'_>, ca
     let from_nbits_str = if arch_dependent {
         "64".to_owned()
     } else if is_isize_or_usize(cast_from) {
-        // FIXME: handle 16 bits `usize` type
-        "32 or 64".to_owned()
+        "16, 32, or 64".to_owned()
     } else {
         from_nbits.to_string()
     };
diff --git a/tests/ui/cast_size.32bit.stderr b/tests/ui/cast_size.32bit.stderr
index cb1620e36a26..496707ef467c 100644
--- a/tests/ui/cast_size.32bit.stderr
+++ b/tests/ui/cast_size.32bit.stderr
@@ -13,7 +13,7 @@ LL -     1isize as i8;
 LL +     i8::try_from(1isize);
    |
 
-error: casting `isize` to `f32` causes a loss of precision (`isize` is 32 or 64 bits wide, but `f32`'s mantissa is only 23 bits wide)
+error: casting `isize` to `f32` causes a loss of precision (`isize` is 16, 32, or 64 bits wide, but `f32`'s mantissa is only 23 bits wide)
   --> tests/ui/cast_size.rs:24:5
    |
 LL |     x0 as f32;
@@ -22,7 +22,7 @@ LL |     x0 as f32;
    = note: `-D clippy::cast-precision-loss` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(clippy::cast_precision_loss)]`
 
-error: casting `usize` to `f32` causes a loss of precision (`usize` is 32 or 64 bits wide, but `f32`'s mantissa is only 23 bits wide)
+error: casting `usize` to `f32` causes a loss of precision (`usize` is 16, 32, or 64 bits wide, but `f32`'s mantissa is only 23 bits wide)
   --> tests/ui/cast_size.rs:26:5
    |
 LL |     x1 as f32;
diff --git a/tests/ui/cast_size.64bit.stderr b/tests/ui/cast_size.64bit.stderr
index b6000a52abb3..1e523b8b4fa1 100644
--- a/tests/ui/cast_size.64bit.stderr
+++ b/tests/ui/cast_size.64bit.stderr
@@ -13,7 +13,7 @@ LL -     1isize as i8;
 LL +     i8::try_from(1isize);
    |
 
-error: casting `isize` to `f32` causes a loss of precision (`isize` is 32 or 64 bits wide, but `f32`'s mantissa is only 23 bits wide)
+error: casting `isize` to `f32` causes a loss of precision (`isize` is 16, 32, or 64 bits wide, but `f32`'s mantissa is only 23 bits wide)
   --> tests/ui/cast_size.rs:24:5
    |
 LL |     x0 as f32;
@@ -22,7 +22,7 @@ LL |     x0 as f32;
    = note: `-D clippy::cast-precision-loss` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(clippy::cast_precision_loss)]`
 
-error: casting `usize` to `f32` causes a loss of precision (`usize` is 32 or 64 bits wide, but `f32`'s mantissa is only 23 bits wide)
+error: casting `usize` to `f32` causes a loss of precision (`usize` is 16, 32, or 64 bits wide, but `f32`'s mantissa is only 23 bits wide)
   --> tests/ui/cast_size.rs:26:5
    |
 LL |     x1 as f32;