parsing - bison shift/reduce conflict -


in following simple grammar, on conflict @ state 4, can 'shift' become taken action without changing rules ? (i thought default shift bison's preferred action)

%token 1 2 3  %%  start : a; : x y z; x : one; z : 2 | three; y : 2 | ;  %%

shift bison's preferred action, , can see in state output shift two in state 4. still report shift-reduce conflict, can take warning if like. (see %expect.) you'd better off fixing grammar:

start : a; : x z | x y z; x : one; y : two; z : 2 | three;

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