Leonardo de Moura 3e1fd06903 refactor(kernel/expr): remove 'null' expression, and operator bool for expression ... After this commit, a value of type 'expr' cannot be a reference to nullptr. This commit also fixes several bugs due to the use of 'null' expressions. TODO: do the same for kernel objects, sexprs, etc. Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>		2013-12-07 23:21:10 -08:00
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lean	fix(frontends/lean/frontend_elaborator): must elaborate type attached to placeholder, it may also contain holes	2013-12-07 15:37:59 -08:00
lua	refactor(kernel/expr): remove 'null' expression, and operator bool for expression	2013-12-07 23:21:10 -08:00