diff --git a/ci/base-tests.sh b/ci/base-tests.sh
index fbb5d1cba48d..64214e3be865 100755
--- a/ci/base-tests.sh
+++ b/ci/base-tests.sh
@@ -59,7 +59,9 @@ rustup override set nightly
 # avoid loop spam and allow cmds with exit status != 0
 set +ex
 
-for file in `find tests | grep "\.rs$"` ; do
+# Excluding `ice-3891.rs` because the code triggers a rustc parse error which
+# makes rustfmt fail.
+for file in `find tests -not -path "tests/ui/crashes/ice-3891.rs" | grep "\.rs$"` ; do
   rustfmt ${file} --check
   if [ $? -ne 0 ]; then
     echo "${file} needs reformatting!"
diff --git a/clippy_lints/src/literal_representation.rs b/clippy_lints/src/literal_representation.rs
index 5c2ca4b1c935..e97845314f9d 100644
--- a/clippy_lints/src/literal_representation.rs
+++ b/clippy_lints/src/literal_representation.rs
@@ -526,23 +526,20 @@ impl LiteralRepresentation {
             if let Some(src) = snippet_opt(cx, lit.span);
             if let Some(firstch) = src.chars().next();
             if char::to_digit(firstch, 10).is_some();
+            let digit_info = DigitInfo::new(&src, false);
+            if digit_info.radix == Radix::Decimal;
+            if let Ok(val) = digit_info.digits
+                .chars()
+                .filter(|&c| c != '_')
+                .collect::<String>()
+                .parse::<u128>();
+            if val >= u128::from(self.threshold);
             then {
-                let digit_info = DigitInfo::new(&src, false);
-                if digit_info.radix == Radix::Decimal {
-                    let val = digit_info.digits
-                        .chars()
-                        .filter(|&c| c != '_')
-                        .collect::<String>()
-                        .parse::<u128>().unwrap();
-                    if val < u128::from(self.threshold) {
-                        return
-                    }
-                    let hex = format!("{:#X}", val);
-                    let digit_info = DigitInfo::new(&hex[..], false);
-                    let _ = Self::do_lint(digit_info.digits).map_err(|warning_type| {
-                        warning_type.display(&digit_info.grouping_hint(), cx, lit.span)
-                    });
-                }
+                let hex = format!("{:#X}", val);
+                let digit_info = DigitInfo::new(&hex, false);
+                let _ = Self::do_lint(digit_info.digits).map_err(|warning_type| {
+                    warning_type.display(&digit_info.grouping_hint(), cx, lit.span)
+                });
             }
         }
     }
diff --git a/tests/ui/crashes/ice-3891.rs b/tests/ui/crashes/ice-3891.rs
new file mode 100644
index 000000000000..05c5134c8457
--- /dev/null
+++ b/tests/ui/crashes/ice-3891.rs
@@ -0,0 +1,3 @@
+fn main() {
+    1x;
+}
diff --git a/tests/ui/crashes/ice-3891.stderr b/tests/ui/crashes/ice-3891.stderr
new file mode 100644
index 000000000000..16aedbd98dec
--- /dev/null
+++ b/tests/ui/crashes/ice-3891.stderr
@@ -0,0 +1,10 @@
+error: invalid suffix `x` for numeric literal
+  --> $DIR/ice-3891.rs:2:5
+   |
+LL |     1x;
+   |     ^^ invalid suffix `x`
+   |
+   = help: the suffix must be one of the integral types (`u32`, `isize`, etc)
+
+error: aborting due to previous error
+