Iterator grammar

parser/src/grammar.pest

@@ -68,6 +68,7 @@ statement = _{
   | if_stmt
   | while_stmt
   | c_for_stmt
+  | for_stmt
   | return_stmt
   | break_stmt
   | continue_stmt
@@ -104,6 +105,10 @@ c_for_stmt = {
     "for" ~ "(" ~ statement ~ expr ~ semicolon ~ statement ~ ")" ~ statement
 }
 
+for_stmt = {
+    "for" ~ "(" ~ identifier ~ "in" ~ expr ~ ")" ~ statement
+}
+
 // ================= EXPRESSIONS =================
 tuple_type = { "(" ~ (type_expr ~ ("," ~ type_expr)*)? ~ ")" }
 path_type  = { static_path ~ ("<" ~ (type_expr ~ ("," ~ type_expr)*)? ~ ">")? }