Errors when rewriting the `tc39/test262` suite

[ericcornelissen]

Relates to #1 and #4

---

The rewriter for tc39/test262 has some flaws and produces errors for some files. For example:

error for ./test/built-ins/RegExp/property-escapes/unsupported-binary-property-Expands_On_NFKD-negated.js: Invalid regular expression: /\P{Expands_On_NFKD}/: Invalid property name (18:1)
SyntaxError: Invalid regular expression: /\P{Expands_On_NFKD}/: Invalid property name (18:1)
    at pp$4.raise (file://.../pp-runtime-gadgets/tc39/node_modules/acorn/dist/acorn.mjs:3567:13)
    at RegExpValidationState.raise (file://.../pp-runtime-gadgets/tc39/node_modules/acorn/dist/acorn.mjs:3841:15)
    at pp$1.regexp_validateUnicodePropertyNameOrValue (file://.../pp-runtime-gadgets/tc39/node_modules/acorn/dist/acorn.mjs:4652:9)
    at pp$1.regexp_eatUnicodePropertyValueExpression (file://.../pp-runtime-gadgets/tc39/node_modules/acorn/dist/acorn.mjs:4637:17)
    at pp$1.regexp_eatCharacterClassEscape (file://.../pp-runtime-gadgets/tc39/node_modules/acorn/dist/acorn.mjs:4594:22)
    at pp$1.regexp_eatAtomEscape (file://.../pp-runtime-gadgets/tc39/node_modules/acorn/dist/acorn.mjs:4362:10)
    at pp$1.regexp_eatReverseSolidusAtomEscape (file://.../pp-runtime-gadgets/tc39/node_modules/acorn/dist/acorn.mjs:4148:14)
    at pp$1.regexp_eatAtom (file://.../pp-runtime-gadgets/tc39/node_modules/acorn/dist/acorn.mjs:4139:10)
    at pp$1.regexp_eatTerm (file://.../pp-runtime-gadgets/tc39/node_modules/acorn/dist/acorn.mjs:4043:28)
    at pp$1.regexp_alternative (file://.../pp-runtime-gadgets/tc39/node_modules/acorn/dist/acorn.mjs:4024:50) {
  pos: 473,
  loc: Position { line: 18, column: 1 },
  raisedAt: 494
}

or

error for ./test/built-ins/ShadowRealm/prototype/importValue/import-value_syntax_error_FIXTURE.js: Unexpected token (4:5)
SyntaxError: Unexpected token (4:5)
    at pp$4.raise (file://.../pp-runtime-gadgets/tc39/node_modules/acorn/dist/acorn.mjs:3567:13)
    at pp$9.unexpected (file://.../pp-runtime-gadgets/tc39/node_modules/acorn/dist/acorn.mjs:766:8)
    at pp$9.semicolon (file://.../pp-runtime-gadgets/tc39/node_modules/acorn/dist/acorn.mjs:743:66)
    at pp$8.parseExpressionStatement (file://.../pp-runtime-gadgets/tc39/node_modules/acorn/dist/acorn.mjs:1232:8)
    at pp$8.parseStatement (file://.../pp-runtime-gadgets/tc39/node_modules/acorn/dist/acorn.mjs:959:24)
    at pp$8.parseTopLevel (file://.../pp-runtime-gadgets/tc39/node_modules/acorn/dist/acorn.mjs:823:21)
    at Parser.parse (file://.../pp-runtime-gadgets/tc39/node_modules/acorn/dist/acorn.mjs:595:15)
    at Function.parse (file://.../pp-runtime-gadgets/tc39/node_modules/acorn/dist/acorn.mjs:645:35)
    at Module.parse (file://.../pp-runtime-gadgets/tc39/node_modules/acorn/dist/acorn.mjs:5955:17)
    at transform (file://.../pp-runtime-gadgets/tc39/rewriter.js:51:20) {
  pos: 135,
  loc: Position { line: 4, column: 5 },
  raisedAt: 137
}

(at first glance, these seem to be the only two types of errors.)

A full log of the rewriter operating on tc39/test262 on commit 53c21d4 is available here: rewrite_log.txt