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Stack-based multi-bracket parenthesis matching for ( [ { ) ] }.
Non-bracket chars are skipped (treated as content).
Tests:
() yes
[{()}] yes
({[}]) no (mismatched closer)
"" yes
(( no (unclosed)
()[](){} yes
(a(b)c) yes (a/b/c skipped)
(() no
]) no
5 balanced
Body uses begin/end-wrapped match inside while:
else if c = ')' || c = ']' || c = '}' then begin
match !stack with
| [] -> ok := false
| top :: rest ->
let pair =
(c = ')' && top = '(') ||
(c = ']' && top = '[') ||
(c = '}' && top = '{')
in
if pair then stack := rest else ok := false
end
Tests side-effecting match arms inside while body, ref-of-list as
stack, multi-char pairing dispatch.
174 baseline programs total.