I see… thanks, but currently Moscow ML cannot compile that file [1], and I 
can’t even find the definition of this new feature …

—Chun

[1] https://github.com/HOL-Theorem-Prover/HOL/pull/634

> Il giorno 02 gen 2019, alle ore 15:44, <michael.norr...@data61.csiro.au> 
> <michael.norr...@data61.csiro.au> ha scritto:
> 
> Dear Chun,
> 
> This is indeed a new feature of the quotation filter.  Its purpose is to keep 
> names consistent, and to reduce the amount of boilerplate typing that 
> script-writers have to generate.
> 
> It's as yet undocumented, but I hope to get to that soon.
> 
> Michael
> 
> On 2/1/19, 06:20, "Chun Tian (binghe)" <binghe.l...@gmail.com> wrote:
> 
>    Hi,
> 
>    (Happy New Year) I found the following code in 
> src/patricia/sptreeScript.sml (added in commit 
> 2b78a8b8ac22b0686a5964a64f79fa8a8a17375e)
> 
>    Theorem list_to_num_set_append
>      `!l1 l2. list_to_num_set (l1 ++ l2) = union (list_to_num_set l1) 
> (list_to_num_set l2)`
>     (Induct \\ rw[list_to_num_set_def]
>      \\ rw[Once insert_union]
>      \\ rw[Once insert_union,SimpRHS]
>      \\ rw[union_assoc]);
> 
>    Where is the definition of the keyword “Theorem”? Is this a new grammar of 
> defining theroems, aiming at preventing inconsistent theorem names in 
> exported theories?
> 
>    Regards,
> 
>    Chun
> 
> 
> 
> 
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