Multi-line f-string interpolations: spliced sub-lex enforces indentation, and lines after them are reported one early
维护者通常 1 天内回复
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评估
- 难度
- 4/5
- 预计耗时
- 3-5 天
- 新手友好度
- 68/100
- Issue 类型
- 缺陷
- 描述清晰度
- 基本清楚
- 活跃度
- 活跃
- 技术栈
- c
- 领域
- compilers, testing-qa
调研方向
Trace the C lexer paths for multi-line f-string interpolation, focusing on the spliced sub-lex indentation checks and newline accounting. Reproduce the two examples, then add regression coverage for the printed result and later diagnostic line; verify that lib/eigen.eigs agrees in the meta-parity test.
由索引模型根据 Issue 内容生成。
描述
Found by /code-review on PR #1324, and pre-existing on main 940af49.
A multi-line f-string interpolation is re-lexed as if it were its own file. The lexer starts that text at column 0 and checks its indentation, so a continuation line that isn't aligned is a hard error, even though the layout tokens are thrown away:
print of f"{ 1 +
2}"
fails with "indentation does not match any outer level" (exit 1). #1324 makes this easier to reach, because a # comment can now end the first line.
Also, newlines inside an f-string do not advance the line counter, so every later diagnostic is reported one line early. A multi-line f-string followed by x is 1 / 0 on line 4 reports "line 3".
Done when
- The spliced sub-lex of an interpolation does not apply indentation rules; the program above prints
3. - Newlines inside an f-string advance the line counter; an error after a multi-line f-string reports its true line (regression test).
-
lib/eigen.eigsagrees (meta-parity test).
- 主要语言
- C
- 星标
- 3
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- 105
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