LEXER: sign before POUND char like [-#"a"] is not recognized as a word and is misinterpreted

[Oldes]

Actual behaviour

>> [-#"a"]
== [#"^""]
>> [-#"b"]
== [#"^""]

In Rebol2 it is also wrong, but with different result:

>> [#"a"-#"z"]
== [#"a" #"^@"]
>> [-#"z"]
== [#"^@"]
>> load {-#"z"}
== #"^@"
>>

Expected behaviour (like in Red)

>> [-#"a"]
== [- #"a"]
>> [-#"b"]
== [- #"b"]
>> load {-#"a"}
== [- #"a"]

Because I want to be able to write more compact charsets:

ch_base64: charset [#"a"-#"z" #"A"-#"Z" #"0"-#"9" #"/" #"+" #"="]

versus

ch_base64: charset [#"a" - #"z" #"A" - #"Z" #"0" - #"9" #"/" #"+" #"="]

[Oldes]

Ren-C throws an error (but I prefer result like in Red)

>> [-#"a"]
ⓘ   Note: use WHY for error information
** Syntax Error: invalid "char" -- ""
** Where: transcode case load trap forever _
** Near: (line 1) [-#"a"]
** File: tmp-boot.r
** Line: 5173

[Oldes]

Related issues:

>> [-#[none]]
== [none]
>> [-#{AA}]
** Syntax error: invalid "binary" -- "-#{AA}"
** Near: (line 1) [-#{AA}]

[Oldes]

Fixed in commit: Oldes/Rebol3@1a4c3a6

[Oldes]

With the above fix it is consistent with cases like:

>> [-""]
== [- ""]

[Oldes]

Here is another case which was fixed now:

>> [-#hhh]
** Syntax error: invalid "integer" -- "-#hhh"
** Near: (line 1) [-#hhh]

Now:

== [- #hhh]