Correctly handle signs in exponents in numeric_literal::format()

[rust.git] / clippy_utils / src / numeric_literal.rs

diff --git a/clippy_utils/src/numeric_literal.rs b/clippy_utils/src/numeric_literal.rs
index 546706d51d7b597c3f6d03b90a1448152533d37b..98f65039b7da9fb2765e72d7a6f6e44bd8ab077f 100644 (file)
--- a/clippy_utils/src/numeric_literal.rs
+++ b/clippy_utils/src/numeric_literal.rs
@@ -162,6 +162,9 @@ pub fn format(&self) -> String {
         }
 
         if let Some(suffix) = self.suffix {
+            if output.ends_with('.') {
+                output.push('0');
+            }
             output.push('_');
             output.push_str(suffix);
         }
@@ -174,6 +177,13 @@ pub fn group_digits(output: &mut String, input: &str, group_size: usize, partial
 
         let mut digits = input.chars().filter(|&c| c != '_');
 
+        // The exponent may have a sign, output it early, otherwise it will be
+        // treated as a digit
+        if let Some('-') = digits.clone().next() {
+            let _ = digits.next();
+            output.push('-');
+        }
+
         let first_group_size;
 
         if partial_group_first {