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[icfp] correctness is by-hand, plus missing words

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ben 2016-03-15 14:58:28 -04:00
parent 1bf6e0008d
commit 722e478c7a
1 changed files with 9 additions and 9 deletions
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icfp-2016/solution.scrbl
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@ -37,11 +37,8 @@ Correct interpretation functions @exact|{${\tt p?}$}| obey three guidelines:
value must have some common structure. value must have some common structure.
} }
@item{ @item{
Non-@racket[#false] results @exact|{${\tt (p?~e)}$}| must be computed by a Non-@racket[#false] results @exact|{${\tt (p?~e)}$}| are computed by a
uniform algorithm. uniform algorithm and must have some common structure.
}
@item{
Non-@racket[#false] results must have some common structure.
} }
] ]
@ -49,9 +46,9 @@ This vague notion of common structure may be expressible as a type in an
appropriate type system. appropriate type system.
It is definitely not a type in the target language's type system. It is definitely not a type in the target language's type system.
The set @exact|{$\elab$}| of @emph{elaboration} functions contains Functions in the set @exact|{$\elab$}| of @emph{elaborations}
function mapping expressions to expressions. map expressions to expressions.
We write elaboration functions as @exact{$\elabf$} and their We write elaboration functions as @exact{$\elabf$} and their application
to an expression @exact{$e$} as @exact{$\llbracket e \rrbracket$}. to an expression @exact{$e$} as @exact{$\llbracket e \rrbracket$}.
Elaborations are allowed to fail raising syntax errors, which we notate as Elaborations are allowed to fail raising syntax errors, which we notate as
@exact|{$\bot$}|. @exact|{$\bot$}|.
@ -100,4 +97,7 @@ If neither @exact|{${\tt e}$}| nor @exact|{${\tt e'}$}| type checks, then we hav
In a perfect world both would diverge, but the fundamental limitations of In a perfect world both would diverge, but the fundamental limitations of
static typing@~cite[fagan-dissertation-1992] and computability static typing@~cite[fagan-dissertation-1992] and computability
keep us imperfect. keep us imperfect.
TODO TODO TODO Extra space hierExtra space hierExtra space hierExtra space
At present, these correctness requirements must be checked manually by the
author of a function in @exact{$\interp$} or @exact{$\elab$}.