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`3 i` parses as `3 ^ i`: an imaginary literal after a factor is read as its exponent

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还没有人认领这个 Issue。

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难度
3/5
预计耗时
1-2 天
新手友好度
70/100
Issue 类型
缺陷
描述清晰度
基本清楚
活跃度
活跃
技术栈
csharp
领域
compilers

调研方向

Start with Syntax.md and SyntaxDocumentedTest, which document and pin the current juxtaposition rule. Trace the parser entry point used by ToEntity() and inspect how imaginary literals are classified after a factor. Done means the proposed imaginary-literal cases parse as multiplication, existing power cases remain unchanged, and the documentation test reflects the new rule.

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描述

3 i parses as 3 ^ i, not 3 * i, so sin(3 i) is evaluated at 3^i (about 0.455 + 0.891i):

"sin(3 i)".ToEntity()   ->  sin(3 ^ i)
"x i".ToEntity()        ->  x ^ i
"(1 + 2) i".ToEntity()  ->  (1 + 2) ^ i
"2 i x".ToEntity()      ->  2 ^ i * x

2.5.0 does the same. The juxtaposition rule inserts ^ before a number written after a number, a name or ), so that x2 is x ^ 2. The lexer reads i as a number, so the rule applies to it as well. Syntax.md records this as a consequence of the rule since #1041, and SyntaxDocumentedTest pins "x i" as "x ^ i".

Proposal: an imaginary literal written after a factor is a factor too. 3 i would be 3 * i and x 2i would be x * 2i, while x2, 3 2 and (x + 1)2 stay powers. 3i, written as one literal, is already 3i. I'd change the rule and the documented row together. Is that the reading you want?

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