Improved for loops

parser/src/grammar.pest

@@ -405,11 +405,11 @@ while_stmt = {
 }
 
 c_for_stmt = {
-    "for" ~ "(" ~ statement ~ expr ~ semicolon ~ statement ~ ")" ~ statement
+    "for" ~ "(" ~ statement ~ statement ~ expr ~ ")" ~ statement
 }
 
 for_stmt = {
-    "for" ~ "(" ~ mutable? ~ pattern ~ "in" ~ expr ~ ")" ~ statement
+    "for" ~ "(" ~ mutable? ~ pattern ~ ":" ~ expr ~ ")" ~ statement
 }
 
 // ------------------------------------------------------