Add fast-ops feature.

src/ast/expr.rs

@@ -190,6 +190,8 @@ pub struct FnCallExpr {
     pub args: StaticVec<Expr>,
     /// Does this function call capture the parent scope?
     pub capture_parent_scope: bool,
+    /// Is this function call a simple symbol-based operator?
+    pub is_standard_operator: bool,
     /// [Position] of the function name.
     pub pos: Position,
 }
@@ -204,6 +206,9 @@ impl fmt::Debug for FnCallExpr {
         if self.capture_parent_scope {
             ff.field("capture_parent_scope", &self.capture_parent_scope);
         }
+        if self.is_standard_operator {
+            ff.field("is_standard_operator", &self.is_standard_operator);
+        }
         ff.field("hash", &self.hashes)
             .field("name", &self.name)
             .field("args", &self.args);
@@ -662,6 +667,7 @@ impl Expr {
                     hashes: calc_fn_hash(f.fn_name(), 1).into(),
                     args: once(Self::StringConstant(f.fn_name().into(), pos)).collect(),
                     capture_parent_scope: false,
+                    is_standard_operator: false,
                     pos,
                 }
                 .into(),