[jayhemnani9910]

Every built-in variable token (NR, NF, FNR, RSTART, ...) sets the lexer to expect an expression, so a / after one starts a regex. gawk 5.3.2 vs main:

$ printf 'a b\nc d\n' | awk '{ print NR / 2 }'
gawk: 0.5
      1
main: Error: Syntax error ... Unterminated regex

$ awk 'BEGIN { RSTART = 4; print RSTART / 2, RLENGTH / 1 }'
gawk: 2 0
main: 401

The second one parses as RSTART concatenated with the regex / 2, RLENGTH /, so it prints a wrong number with no error. x / 2 with a user variable already works.

The built-in variables are operands, so their tokens now use accept_operator, like identifiers. ARGIND had no callback and gets the same.

New test slash_after_special_variable_divides fails without the change. cargo test --workspace: 211 passed (210 on main plus the new one), clippy and fmt clean. 15 programs with / and /= after NR, NF, FNR, RSTART, RLENGTH and ARGC, and regexes after NR ~ and NR,, give the same result as gawk apart from two that differ for other reasons (ARGC's value, NR in an END-only program, which #140 fixes).

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[sylvestre]

could you please also cover NR /= 2 here?
and maybe add NR/=1 to lexer_test_regex_ambiguity in lexer/src/tests.rs

[jayhemnani9910]

Added both in f15885c: NR /= 2 in slash_after_special_variable_divides, and NR/=1 in lexer_test_regex_ambiguity (it fails on main, where /=1 starts a regex). The test sets NR first (NR = 6; NR /= 2), because on main NR in END after a file is still 0 (#140), and gawk keeps NR an integer, so NR /= 2 in a main rule truncates there.

[Alonely0]

sorry, needs to be rebased!

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[sylvestre]

Thanks for your PR