/// Checks if the specified expression is a built-in range literal.
/// (See: `LoweringContext::lower_expr()`).
+///
+/// FIXME(#60607): This function is a hack. If and when we have `QPath::Lang(...)`,
+/// we can use that instead as simpler, more reliable mechanism, as opposed to using `SourceMap`.
pub fn is_range_literal(sm: &SourceMap, expr: &Expr) -> bool {
// Returns whether the given path represents a (desugared) range,
// either in std or core, i.e. has either a `::std::ops::Range` or