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| author |  Pierre-Marie Pédrot <pierre-marie.pedrot@inria.fr> | 2017-08-29 19:05:57 +0200 |
|---|---|---|
| committer | Pierre-Marie Pédrot <pierre-marie.pedrot@inria.fr> | 2017-09-04 11:28:49 +0200 |
| commit | 1db568d3dc88d538f975377bb4d8d3eecd87872c (patch) | |
| tree | d8e35952cc8f6111875e664d8884dc2c7f908206 /pretyping/coercion.ml | |
| parent | 3072bd9d080984833f5eb007bf15c6e9305619e3 (diff) | |
Making detyping potentially lazy.
The internal detype function takes an additional arguments dictating
whether it should be eager or lazy.
We introduce a new type of delayed `DAst.t` AST nodes and use it for
`glob_constr`.
Such type, instead of only containing a value, it can contain a lazy
computation too. We use a GADT to discriminate between both uses
statically, so that no delayed terms ever happen to be
marshalled (which would raise anomalies).
We also fix a regression in the test-suite:
Mixing laziness and effects is a well-known hell. Here, an exception
that was raised for mere control purpose was delayed and raised at a
later time as an anomaly. We make the offending function eager.
Diffstat (limited to 'pretyping/coercion.ml')
| -rw-r--r-- | pretyping/coercion.ml | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/pretyping/coercion.ml b/pretyping/coercion.ml index 535a62046..fc0a650bc 100644 --- a/pretyping/coercion.ml +++ b/pretyping/coercion.ml @@ -77,8 +77,8 @@ let apply_pattern_coercion ?loc pat p = List.fold_left (fun pat (co,n) -> let f i = - if i<n then (CAst.make ?loc @@ Glob_term.PatVar Anonymous) else pat in - CAst.make ?loc @@ Glob_term.PatCstr (co, List.init (n+1) f, Anonymous)) + if i<n then (DAst.make ?loc @@ Glob_term.PatVar Anonymous) else pat in + DAst.make ?loc @@ Glob_term.PatCstr (co, List.init (n+1) f, Anonymous)) pat p (* raise Not_found if no coercion found *) |