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Mirror of https://github.com/leanprover/lean2 in case it ever disappears
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Leonardo de Moura 20a36e98ec feat(library/elaborator): modify how elaborator handles constraints of the form ?M << P and P << ?M, where P is a proposition. 
Before this commit, the elaborator would only assign ?M <- P, if P was normalized. This is bad since normalization may "destroy" the structure of P.

For example, consider the constraint
[a : Bool; b : Bool; c : Bool] ⊢ ?M::1 ≺ implies a (implies b (and a b))

Before this, ?M::1 will not be assigned to the "implies-term" because the "implies-term" is not normalized yet.
So, the elaborator would continue to process the constraint, and convert it into:

[a : Bool; b : Bool; c : Bool] ⊢ ?M::1 ≺ if Bool a (if Bool b (if Bool (if Bool a (if Bool b false true) true) false true) true) true

Now, ?M::1 is assigned to the term
     if Bool a (if Bool b (if Bool (if Bool a (if Bool b false true) true) false true) true) true

This is bad, since the original structure was lost.

This commit also contains an example that only works after the commit is applied.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
2013-11-29 09:15:01 -08:00
doc doc(lua): add options documentation 2013-11-28 11:02:34 -08:00
examples/lean Fix typo 2013-09-05 19:18:55 -07:00
script fix(script/demangle_cpptype): process line-by-line, instead of waiting for EOF 2013-09-29 18:36:01 -07:00
src feat(library/elaborator): modify how elaborator handles constraints of the form ?M << P and P << ?M, where P is a proposition. 2013-11-29 09:15:01 -08:00
tests feat(library/elaborator): modify how elaborator handles constraints of the form ?M << P and P << ?M, where P is a proposition. 2013-11-29 09:15:01 -08:00
.gitignore chore(.gitignore): hide '*.md.lua' files 2013-11-18 14:14:23 -08:00
.travis.osx.yml chore(travis): fix .travis.osx.yml 2013-11-12 23:15:03 -05:00
.travis.windows.yml chore(travis): fix dropbox_key in windows build 2013-11-16 23:44:31 -05:00
.travis.yml chore(travis): restore multiple builds 2013-11-17 03:04:37 -05:00
LICENSE Add LICENSE file 2013-07-15 18:55:48 -07:00
README.md doc(README.md): "Code coverage" => "Coverage" to fit in one line 2013-11-11 20:42:15 -05:00

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