test

        int depth=1;

        size_t closeIdx=to;

        for(size_t i=from+1;i<to;++i){

            if(words[i].text=="{") ++depth;

            else if(words[i].text=="}"){

            // Only at a statement-start position (right after ';'/'&&'/

            // '||', or immediately after the opening '{'/keyword itself)

            // does a bare "{"/"}" count as real compound-command syntax

            // here -- same guard collectFunctionDefinitions()'s own

            // "atStmtStart" already applies for the identical reason (see

            // its comment): otherwise an ORDINARY argument word that just

            // happens to equal "}" (rare) or, far more commonly, a

            // "done"/"fi"/"esac" arriving via the OUTER loop just below

            // this one applying the SAME missing guard (e.g. "{ cmd | cmd2

            // ; echo done; }" -- "done" here is plainly cat's own

            // argument, not a real while-loop terminator) would desync

            // this depth count and either close the group too early or

            // (as observed) miss the real closing '}' entirely.

            bool atStmtStart=(words[i-1].text==";" || words[i-1].text=="&&" ||

                               words[i-1].text=="||");

            if(atStmtStart && words[i].text=="{") ++depth;

            else if(atStmtStart && words[i].text=="}"){

                if(--depth==0){ closeIdx=i; break; }

            }

        }