Can't compile with bison 3.6.1, but bison 3.5.4 is no problem

[vowstar]

Can you attach an example that shows the issue? (Must be openly licensed, ideally in test_regress format.)

This code using bison 3.5.4 with no problem.
https://github.com/verilator/verilator/blob/master/src/verilog.y#L655-L673

But when I upgrade to bison 3.6.1, it have something break.

The original code :

%token<fl>		yVL_CLOCK		"/*verilator sc_clock*/"
%token<fl>		yVL_CLOCKER		"/*verilator clocker*/"
%token<fl>		yVL_NO_CLOCKER		"/*verilator no_clocker*/"
%token<fl>		yVL_CLOCK_ENABLE	"/*verilator clock_enable*/"
%token<fl>		yVL_COVERAGE_BLOCK_OFF	"/*verilator coverage_block_off*/"
%token<fl>		yVL_FULL_CASE		"/*verilator full_case*/"
%token<fl>		yVL_INLINE_MODULE	"/*verilator inline_module*/"
%token<fl>		yVL_ISOLATE_ASSIGNMENTS	"/*verilator isolate_assignments*/"
%token<fl>		yVL_NO_INLINE_MODULE	"/*verilator no_inline_module*/"
%token<fl>		yVL_NO_INLINE_TASK	"/*verilator no_inline_task*/"
%token<fl>		yVL_SC_BV		"/*verilator sc_bv*/"
%token<fl>		yVL_SFORMAT		"/*verilator sformat*/"
%token<fl>		yVL_PARALLEL_CASE	"/*verilator parallel_case*/"
%token<fl>		yVL_PUBLIC		"/*verilator public*/"
%token<fl>		yVL_PUBLIC_FLAT		"/*verilator public_flat*/"
%token<fl>		yVL_PUBLIC_FLAT_RD	"/*verilator public_flat_rd*/"
%token<fl>		yVL_PUBLIC_FLAT_RW	"/*verilator public_flat_rw*/"
%token<fl>		yVL_PUBLIC_MODULE	"/*verilator public_module*/"
%token<fl>		yVL_SPLIT_VAR		"/*verilator split_var*/"

The code generated and can't compile

    yVL_CLOCK = 610,               /* "/*verilator sc_clock*/"  */
    yVL_CLOCKER = 611,             /* "/*verilator clocker*/"  */
    yVL_NO_CLOCKER = 612,          /* "/*verilator no_clocker*/"  */
    yVL_CLOCK_ENABLE = 613,        /* "/*verilator clock_enable*/"  */
    yVL_COVERAGE_BLOCK_OFF = 614,  /* "/*verilator coverage_block_off*/"  */
    yVL_FULL_CASE = 615,           /* "/*verilator full_case*/"  */
    yVL_INLINE_MODULE = 616,       /* "/*verilator inline_module*/"  */
    yVL_ISOLATE_ASSIGNMENTS = 617, /* "/*verilator isolate_assignments*/"  */
    yVL_NO_INLINE_MODULE = 618,    /* "/*verilator no_inline_module*/"  */
    yVL_NO_INLINE_TASK = 619,      /* "/*verilator no_inline_task*/"  */
    yVL_SC_BV = 620,               /* "/*verilator sc_bv*/"  */
    yVL_SFORMAT = 621,             /* "/*verilator sformat*/"  */
    yVL_PARALLEL_CASE = 622,       /* "/*verilator parallel_case*/"  */
    yVL_PUBLIC = 623,              /* "/*verilator public*/"  */
    yVL_PUBLIC_FLAT = 624,         /* "/*verilator public_flat*/"  */
    yVL_PUBLIC_FLAT_RD = 625,      /* "/*verilator public_flat_rd*/"  */
    yVL_PUBLIC_FLAT_RW = 626,      /* "/*verilator public_flat_rw*/"  */
    yVL_PUBLIC_MODULE = 627,       /* "/*verilator public_module*/"  */
    yVL_SPLIT_VAR = 628,           /* "/*verilator split_var*/"  */

What 'verilator --version' are you using? Did you try it with the git master version?

Source code from v4.032, v4.034, master

Would you be willing to try to fix Verilator yourself with assistance?

I reported a bug to bison
akimd/bison#38