Added 128bit ints

Added i128 and u128 to the AST, pretty-printing and the WIP parser.
This should fix #8.

Author: harpocrates

src/Language/Rust/Parser/Parser2.y

@@ -912,6 +912,8 @@ lit (Spanned (LiteralTok litTok suffix_m) s) = Spanned (parseLit litTok suffix s
                (Just (Name "u32"))   -> U32
                (Just (Name "i64"))   -> I64
                (Just (Name "u64"))   -> U64
+               (Just (Name "i128"))  -> I128
+               (Just (Name "u128"))  -> U128
 
 isPathSegmentIdent :: Ident -> Bool
 isPathSegmentIdent i = True

src/Language/Rust/Syntax/AST.hs

@@ -432,8 +432,8 @@ data LifetimeDef a
 -- Merged [FloatTy](https://docs.serde.rs/syntex_syntax/ast/enum.FloatTy.html)
 data Suffix
   = Unsuffixed
-  | Is | I8 | I16 | I32 | I64 
-  | Us | U8 | U16 | U32 | U64 
+  | Is | I8 | I16 | I32 | I64 | I128 
+  | Us | U8 | U16 | U32 | U64 | U128
   |                 F32 | F64
    deriving (Eq, Enum, Bounded)
 
@@ -444,11 +444,13 @@ instance Show Suffix where
   show I16 = "i16"
   show I32 = "i32"
   show I64 = "i64"
+  show I128 = "i128"
   show Us = "usize"
   show U8 = "u8"
   show U16 = "u16"
   show U32 = "u32"
   show U64 = "u64"
+  show U128 = "u128"
   show F32 = "f32"
   show F64 = "f64"