Parser: an attribute or doc comment in front of a `{...` spread type changes how it is read
维护者通常 1 天内回复
还没有人认领这个 Issue。
评估
- 难度
- 4/5
- 预计耗时
- 1-2 天
- 新手友好度
- 55/100
- Issue 类型
- 缺陷
- 描述清晰度
- 基本清楚
- 活跃度
- 活跃
- 技术栈
- ocaml
- 领域
- compilers
调研方向
Start by reading the lookahead in res_core.ml and the referenced context in #9115, which keeps the current behaviors. Reproduce the table with bsc -bs-no-builtin-ppx -only-parse -dparsetree to trace how prefixes affect {... classification. Done means prefixes no longer change the classification, both reported syntax errors are fixed, and the compatibility change has a changelog entry.
由索引模型根据 Issue 内容生成。
描述
A type body starting with {... can be a record spread or an object spread. Without a prefix, the parser reads it as a record unless a quoted field follows. With an attribute or a doc comment in front, it takes a different path, so the prefix changes what the declaration means or makes it a syntax error.
Checked on master at 85f31fbb15 with bsc -bs-no-builtin-ppx -only-parse -dparsetree:
type t = … |
no prefix | @attr |
/** d */ |
|---|---|---|---|
{...base, y: int} |
record | syntax error | record |
{...base} |
record | object type | record |
{...base, "y": int} |
object type | object type | syntax error |
The same holds after private, e.g. type t = private @attr {...base, y: int} is a syntax error.
Cause: after an attribute, the lookahead in res_core.ml treats {... as the start of a type expression (object type); after a doc comment, the record path is taken unconditionally. #9115 (for #9106) keeps both behaviours as they are, so nothing master accepts changes there.
Expected: the prefix doesn't matter, and {... is classified as without one. That fixes both syntax errors, but it also turns @attr {...base} from an object type into a record, which changes code that compiles today, so it needs a changelog entry.
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rescript-lang/rescript#9106 ·
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