Make boa::parse emit error on invalid input, not panic

boa/src/syntax/ast/op.rs

@@ -602,7 +602,7 @@ pub enum CompOp {
     /// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/in
     In,
 
-    /// The `instanceop` operator returns `true` if the specified object is an instance of the
+    /// The `instanceof` operator returns `true` if the specified object is an instance of the
     /// right hand side object.
     ///
     /// Syntax: `obj instanceof Object`

boa/src/syntax/lexer/number.rs

@@ -226,6 +226,17 @@ impl<R> Tokenizer<R> for NumberLiteral {
             }
         }
 
+        //Checks if the next
+        let digit_char = cursor.peek();
+
+        if let Some(digit) = digit_char? {
+            if !digit.is_digit(kind.base()) {
+                return Err(Error::syntax(
+                    "character was not in expected digit",
+                    cursor.pos(),
+                ));
+            }
+        }
         // Consume digits until a non-digit character is encountered or all the characters are consumed.
         cursor.take_while_pred(&mut buf, &|c: char| c.is_digit(kind.base()))?;
 
@@ -295,7 +306,7 @@ impl<R> Tokenizer<R> for NumberLiteral {
                 let val = f64::from_str(&buf).expect("Failed to parse float after checks");
                 let int_val = val as i32;
 
-                // The truncated float should be identically to the non-truncated float for the conversion to be loss-less, 
+                // The truncated float should be identically to the non-truncated float for the conversion to be loss-less,
                 // any other different and the number must be stored as a rational.
                 #[allow(clippy::float_cmp)]
                 if (int_val as f64) == val {