Lua 5.1 vs LuaJIT Lua 5.2 compatibility semgrep rules

lua51_vs_luajit_compat.yaml

# Rules for programs which must run under both LuaJIT and PUC Lua 5.1
# and which thus may not rely on the 5.2 LuaJIT compatibility features
# See http://luajit.org/extensions.html
rules:
  - id: xpcall-args
    pattern-either:
      # theoretically could be fine e.g. if (empty vararg!), but practically never is
      - pattern: xpcall($FN, $ERRHAND, $EXP, ...)
      # the following could also theoretically be fine, but practically are a major code smell
      - pattern: xpcall($FN1, $FN2(...))
      - pattern: xpcall($FN(...))
    message: "Arguments passed to `xpcall` will be ignored by Lua 5.1"
    languages: [lua]
    severity: ERROR
  - id: goto-labels
    pattern-either:
      - pattern: "goto $LABEL"
      - pattern: "::$LABEL::"
    message: "Goto & labels don't exist in Lua 5.1"
    languages: [lua]
    severity: ERROR
  - id: log-with-base
    pattern: math.log($X, $BASE)
    message: "Lua 5.1 doesn't support a base for logarithms"
    languages: [lua]
    severity: ERROR
  - id: rep-with-sep
    pattern: string.rep($STR, $N, $SEP)
    message: "Lua 5.1 doesn't support a seperator for `string.rep`"
    languages: [lua]
    severity: ERROR