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variables can be used before definition

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change program to command line
change trace back info
change print function of nasal_vec and nasal_hash
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Li Haokun
2021-08-03 18:55:11 +08:00
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parent d0616ef028
commit fa618eb97f
7 changed files with 178 additions and 140 deletions
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@@ -844,5 +844,9 @@ You will get an error of 'undefined symbol', instead of nothing happening in mos
This change is __controversial__ among FGPRC's members.
So maybe in the future i will use dynamic analysis again to cater to the habits of senior programmers.
(2021/8/3 update) __Now i use scanning ast twice to reload symbols.
So this difference does not exist from this update.__
But a new difference is that if you call a variable before defining it, you'll get nil instead of 'undefined error'.
In this new interpreter, function doesn't put dynamic arguments into vector 'arg' automatically.
So if you use 'arg' without definition, you'll get an error of 'undefined symbol'.