In Isabelle2020, when isabelle jedit is started without a session
context, e.g. `isabelle jedit -l ASpec`, theory imports with path
references cause the isabelle process to hang.
Since sessions now declare directories, Isabelle can find those files
without path reference and we therefore remove all such path references
from import statements. With this, `jedit` and `build` should work with
and without explicit session context as before.
Signed-off-by: Gerwin Klein <gerwin.klein@data61.csiro.au>
Added word_log2 and word_clz (inline for now, will migrate them out to
lib later).
Proved most important properties of word_log2 and some basic
count leading zeros properties (word_clz). The former were painful.
Thanks to Thomas, we have a nice tactic for dealing with complicated
obj_at' predicates in conclusion: normalise_obj_at'
Gerwin Klein
Pang Luo
Matthew Brecknell
Alejandro Gomez-Londono
Thomas Sewell
Daniel Matichuk
Gao Xin
Rafal Kolanski
Gerwin Klein
Gao Xin