#include "HsVersions.h"
+import {-# SOURCE #-} HsExpr( SyntaxExpr )
import Type ( Type )
-import HsTypes ( SyntaxName )
import Outputable
import FastString
import Ratio ( Rational )
\begin{code}
data HsLit
- = HsChar Int -- Character
- | HsCharPrim Int -- Unboxed character
+ = HsChar Char -- Character
+ | HsCharPrim Char -- Unboxed character
| HsString FastString -- String
| HsStringPrim FastString -- Packed string
| HsInt Integer -- Genuinely an Int; arises from TcGenDeriv,
(HsDoublePrim x1) == (HsDoublePrim x2) = x1==x2
lit1 == lit2 = False
-data HsOverLit -- An overloaded literal
- = HsIntegral Integer SyntaxName -- Integer-looking literals;
- -- The name is fromInteger
- | HsFractional Rational SyntaxName -- Frac-looking literals
- -- The name is fromRational
+data HsOverLit id -- An overloaded literal
+ = HsIntegral Integer (SyntaxExpr id) -- Integer-looking literals;
+ | HsFractional Rational (SyntaxExpr id) -- Frac-looking literals
+ -- Before type checking, the SyntaxExpr is 'fromInteger' or 'fromRational'
+ -- After type checking, it is (fromInteger 3) or lit_78; that is,
+ -- the expression that should replace the literal.
+ -- This is unusual, because we're replacing 'fromInteger' with a call
+ -- to fromInteger. Reason: it allows commoning up of the fromInteger
+ -- calls, which wouldn't be possible if the desguarar made the application
-- Comparison operations are needed when grouping literals
-- for compiling pattern-matching (module MatchLit)
-instance Eq HsOverLit where
+instance Eq (HsOverLit id) where
(HsIntegral i1 _) == (HsIntegral i2 _) = i1 == i2
(HsFractional f1 _) == (HsFractional f2 _) = f1 == f2
l1 == l2 = False
-instance Ord HsOverLit where
+instance Ord (HsOverLit id) where
compare (HsIntegral i1 _) (HsIntegral i2 _) = i1 `compare` i2
compare (HsIntegral _ _) (HsFractional _ _) = LT
compare (HsFractional f1 _) (HsFractional f2 _) = f1 `compare` f2
ppr (HsDoublePrim d) = rational d <> text "##"
ppr (HsIntPrim i) = integer i <> char '#'
-instance Outputable HsOverLit where
+instance Outputable (HsOverLit id) where
ppr (HsIntegral i _) = integer i
ppr (HsFractional f _) = rational f
\end{code}