An underscore `_` character or a numeric literal `u8`, `i32`, `f64`, etc has
been used as the identifier for a lifetime.
-Erroneous code example:
+Erroneous code example 1:
```
-fn some_function<'_>(string1: &'_ str, string2: &'_ str) -> &'_ str {
+fn some_function<'_>(str1: &'_ str, str2: &'_ str) -> &'_ str {
//Some code
}
```
or Erroneous code example 2:
```
-fn some_function<'u8>(string1: &'u8 str, string2: &'u8 str) -> &'u8 str {
+fn some_function<'u8>(str1: &'u8 str, str2: &'u8 str) -> &'u8 str {
//Some code
}
```
Corrected code example:
```
-fn some_function<'a>(string1: &'a str, string2: &'a str) -> &'a str {
+fn some_function<'a>(str1: &'a str, str2: &'a str) -> &'a str {
//Some code
}
```