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Author SHA1 Message Date
Leonardo de Moura
4dd6cead83 refactor(equality): make homogeneous equality the default equality 
It was not a good idea to use heterogeneous equality as the default equality in Lean.
It creates the following problems.

- Heterogeneous equality does not propagate constraints in the elaborator.
For example, suppose that l has type (List Int), then the expression
     l = nil
will not propagate the type (List Int) to nil.

- It is easy to write false. For example, suppose x has type Real, and the user
writes x = 0. This is equivalent to false, since 0 has type Nat. The elaborator cannot introduce
the coercion since x = 0 is a type correct expression.

Homogeneous equality does not suffer from the problems above.
We keep heterogeneous equality because it is useful for generating proof terms.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-29 16:20:06 -07:00
Leonardo de Moura
d0009d0242 feat(frontends/lean): make the first argument of if-expression implicit, add support for marking implicit arguments on builtin symbols (aka semantic attachments) 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-29 15:53:50 -07:00
Leonardo de Moura
2d88922543 feat(frontends/lean/elaborator): solve easy overloads at preprocessing time 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-29 10:07:15 -07:00
Leonardo de Moura
7c8daf8974 fix(kernel/metavar): make sure the justification and substitution are always matching each other 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-29 02:39:52 -07:00
Leonardo de Moura
2c6d4d2225 fix(kernel/normalizer): do not apply substitutions in the normalizer 
It is incorrect to apply substitutions during normalization.
The problem is that we do not have support for tracking justifications in the normalizer. So, substitutions were being silently applied during normalization. Thus, the correctness of the conflict resolution in the elaboration was being affected.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-29 02:14:48 -07:00
Leonardo de Moura
dbefc91151 fix(kernel/metavar): add normalize assignment justification 
We need that when we normalize the assignment in a metavariable environment.
That is, we replace metavariable in a substitution with other assignments.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-27 11:02:34 -07:00
Leonardo de Moura
cb06d0a959 test(frontends/lean): add example showing higher order matching is working, and is useful 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-24 20:18:48 -07:00
Leonardo de Moura
02c22e509d fix(tests/lean): remove obsolete comments 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-24 20:16:02 -07:00
Leonardo de Moura
250cf70410 test(frontends/lean): all 'bad' examples can be solved 
Move them to the main test directory

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-24 20:12:58 -07:00
Leonardo de Moura
c1c1af4b98 fix(tests/lean): add parenthesis 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-24 20:04:50 -07:00
Leonardo de Moura
a5c3829d1b feat(kernel): add unexpected_metavar_occurrence exception 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-24 19:56:44 -07:00
Leonardo de Moura
46b9b2114a fix(tests/lean): adjust error messages in the expected output 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-24 19:27:26 -07:00
Leonardo de Moura
e55fb4f165 fix(tests/lean): adjust expected results, the new result is also acceptable 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-24 17:54:09 -07:00
Leonardo de Moura
d2f9c24d3c fix(tests/lean): adjust tests 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-24 15:42:17 -07:00
Leonardo de Moura
a7f94b55db fix(frontends/lean/elaborator): fix bugs and adjust tests 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-24 15:29:56 -07:00
Leonardo de Moura
29ad71f9fc test(conversion): add more conversion tests 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-15 15:35:08 -07:00
Leonardo de Moura
99a163f11d Simplify metavariable context. Now, we have only 'lift' and 'inst' instead of 'subst', 'lift' and 'lower' 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-16 19:32:28 -07:00
Leonardo de Moura
63e102055e Move metavariables to the kernel. This is the first step for implementing the new elaborator. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-15 12:09:01 -07:00
Leonardo de Moura
4c67721d32 Fix test error on Cygwin 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-09 18:35:11 -07:00
Leonardo de Moura
d912c9cd09 Add more 'bad' examples 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-09 09:19:49 -07:00
Leonardo de Moura
0a08494f4d Add another bad example for current elaborator 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-08 23:21:43 -07:00
Leonardo de Moura
2ca30571b4 Display the input term in the output of the Check command. It is useful to see the fully elaborated term. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-08 22:55:21 -07:00
Leonardo de Moura
59a589037e Keep expanded form when pretty printings variable declarations with implicit marks (i.e., curly braces) 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-08 11:23:46 -07:00
Leonardo de Moura
df116f88e0 Improve pretty printer for Pi's 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-08 11:04:07 -07:00
Leonardo de Moura
6bb9fc859e Add examples that demonstrate limitations of the current elaborator. The new design, we are working on, will be able to solve them. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-07 19:40:40 -07:00
Leonardo de Moura
b92bbeb83b Add casting propagation and normalization 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-06 20:45:26 -07:00
Leonardo de Moura
c0c2f52087 Add Cast, DomInj and RanInj. Improve operator << for lean_frontend objects. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-06 18:32:15 -07:00
Leonardo de Moura
b62816cc25 Fix problem with pretty printer. Add another test for elaborator 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-06 18:01:11 -07:00
Leonardo de Moura
edafd519e1 Add missing case to elaborator 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-06 17:43:08 -07:00
Leonardo de Moura
26bf7bcaac Fix bug in the elaborator. Move character ' to class A 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-06 17:12:35 -07:00
Leonardo de Moura
8840b37258 Fix type checker and elaborator for let expressions. Fix get_coercions (we need to pass the context). Fix pretty printer for def_type_mismatch_exception. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-06 11:02:00 -07:00
Leonardo de Moura
2459c4ae7c Add (optional) type to let declarations 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-06 10:06:26 -07:00
Leonardo de Moura
6da194334e Move 'slow' test files to different subdir. Modify CTestCustom.cmake.in to run leantests. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-06 08:48:12 -07:00
Leonardo de Moura
6f3b0c30fb Add 'Variables' command. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-06 08:48:12 -07:00
Leonardo de Moura
3dc55c452c Parse decimal values 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-06 08:48:12 -07:00
Leonardo de Moura
87d3961158 Improve elaborator error messages 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-04 16:36:58 -07:00
Leonardo de Moura
613d83cdf4 Improve application type mismatch errors. We also show the implicit arguments (not just their types) 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-04 16:36:58 -07:00
Leonardo de Moura
be7fa0932a Add unicode name for the types: Nat, Int and Real 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-04 09:03:41 -07:00
Leonardo de Moura
e955c054ca Modify type checker. Now, it only accepts builtin values that have been declared in the environment. The idea is to be able to track which classes of builtin values have been used in a given environment. We want to be able to quantify the size of the trusted code base for a particular development. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-04 08:30:04 -07:00
Leonardo de Moura
fc9e395818 Define absolute value function and notation for it. Add new example. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-03 20:39:54 -07:00
Leonardo de Moura
3992c4b8f9 Define divides, and add examples 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-03 20:18:20 -07:00
Leonardo de Moura
51422fe654 Modify the parser for accepting expressions such as: 'fun a b, f a b', 'forall a, f a > 0', etc. This is just syntax sugar for 'fun (a : _) (b : _), f a b' and 'forall a : _, f a > 0' 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-03 17:24:05 -07:00
Leonardo de Moura
6f3fa63ccb Add missing test 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-03 14:51:34 -07:00
Leonardo de Moura
a341643335 Fix unit tests for Windows 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-03 10:44:51 -07:00
Leonardo de Moura
544229e5d3 Create pp::unicode option. The idea is to be able to disable unicode characters, but still be able to use mixfix notation. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-03 10:11:45 -07:00
Leonardo de Moura
e031d7bc10 Improve error messages when overloads+coercions do not work 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-02 20:05:47 -07:00
Leonardo de Moura
fd44ec8d79 Improve application type mismatch error messages 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-02 18:28:12 -07:00
Leonardo de Moura
72188691de Add hyperbolic functions 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-02 17:28:43 -07:00
Leonardo de Moura
4eaba93591 Add trigonometric functions 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-02 17:03:02 -07:00
Leonardo de Moura
395513258e Define mod and unary minus 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-02 16:31:44 -07:00