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the Error type; better lexer error reporting

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This commit is contained in:
aarne
2006-09-01 15:11:22 +00:00
parent 66d3c75031
commit fda42f61c4
9 changed files with 132 additions and 48 deletions
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6
lib/prelude/Predef.gf
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@@ -11,9 +11,11 @@ resource Predef = {
param PBool = PTrue | PFalse ;
oper Int : Type = variants {} ; -- the type of integers
oper Ints : Int -> Type = variants {} ; -- the type of integers from 0 to n
oper Error : Type = variants {} ; -- the empty type
oper Int : Type = variants {} ; -- the type of integers
oper Ints : Int -> Type = variants {} ; -- the type of integers from 0 to n
oper error : Str -> Error = variants {} ; -- forms error message
oper length : Tok -> Int = variants {} ; -- length of string
oper drop : Int -> Tok -> Tok = variants {} ; -- drop prefix of length
oper take : Int -> Tok -> Tok = variants {} ; -- take prefix of length