Make ".e0" not parse as 0.0

This forces floats to have either a digit before the separating point, or after. Thus ".e0" is invalid like ".", when using `parse()`.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/libcore/num/dec2flt/parse.rs b/src/libcore/num/dec2flt/parse.rs
index d20986faa0f..69418434ebe 100644
--- a/src/libcore/num/dec2flt/parse.rs
+++ b/src/libcore/num/dec2flt/parse.rs
@@ -73,7 +73,8 @@ pub fn parse_decimal(s: &str) -> ParseResult {
         }
         Some(&b'.') => {
             let (fractional, s) = eat_digits(&s[1..]);
-            if integral.is_empty() && fractional.is_empty() && s.is_empty() {
+            if integral.is_empty() && fractional.is_empty() {
+                // We require at least a single digit before or after the point.
                 return Invalid;
             }