yacc issue: index out of range

[tbg]

likely identical twin of vitessio/vitess#767

    s := "SELECT(F(F(F(F(F(F(F" +
        "(F(F(F(F(F(F(F(F(F(F" +
        "(F(F(F(F(F(F(F(F(F(F" +
        "(F(F(F(F(F(F(F(F(F(F" +
        "(F(F(F(F(F(F(F(F(F(T" +
        "(F(F(F(F(F(F(F(F(F(F" +
        "(F(F(F(F(F(F(F(F(F(F" +
        "(F(F(F(F(F(F(F(F(F(F" +
        "(F(F(F(F(F(F(F(F(F(F" +
        "(F(F(F(F(F(F(F(F(F((" +
        "F(0"

    Parse(s)

test code in #1802

stack trace:

goroutine 1 [running]:
github.com/cockroachdb/cockroach/sql/parser.sqlParse(0x2208386ac0, 0x2083ba400, 0x0)
/var/folders/yy/4q8rrssd27vdgbr59w9qbffr0000gn/T/go-fuzz-build896428593/src/github.com/cockroachdb/cockroach/sql/parser/yaccpar:207 +0x548df
github.com/cockroachdb/cockroach/sql/parser.Parse(0x2083b1380, 0xcb, 0x0, 0x0, 0x0, 0x0, 0x0)
/var/folders/yy/4q8rrssd27vdgbr59w9qbffr0000gn/T/go-fuzz-build896428593/src/github.com/cockroachdb/cockroach/sql/parser/parse.go:50 +0x16a

[petermattis]

This seems to be some problem in the generated code during error recovery when sqlMaxDepth (default 200) is reached.