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style-guide: Clarify let-else further #113139

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Jun 29, 2023
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style-guide: Clarify let-else further #113139

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26 changes: 24 additions & 2 deletions src/doc/style-guide/src/statements.md
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Original file line number Diff line number Diff line change
Expand Up @@ -159,8 +159,8 @@ before the `else`.

If the initializer expression is multi-line, the `else` keyword and opening
brace of the block (i.e. `else {`) should be put on the same line as the end of
the initializer expression, with a space between them, if all the following are
true:
the initializer expression, with a space between them, if and only if all the
following are true:
Comment on lines 160 to +163
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@calebcartwright calebcartwright Jun 28, 2023 •
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I feel like the ambiguity comes from the fact that this all starts with the "if the initializer expression is multi-line" up on line 160, as that could be read as meaning the text that follows is not applicable if the expr itself is single line.

I'll think on some additional text proposals, but wanted to go ahead and share that.

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@joshtriplett joshtriplett Jun 29, 2023 •
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That's true, but in the single-line case it doesn't matter if you try to apply these rules or not; the three conditions can't possibly hold for a single-line initializer. You can't have a single-line initializer expression that consists of nothing but closing parentheses, square brackets, and/or braces.

So, whether you look at this case and go "doesn't apply because it's not multi-line" or look at this case and go "doesn't apply because the conditions don't hold", either way you go on to the next case.


* The initializer expression ends with one or more closing
parentheses, square brackets, and/or braces
Expand Down Expand Up @@ -209,6 +209,28 @@ fn main() {
else {
return;
};

let LongStructName(AnotherStruct {
multi,
line,
pattern,
}) = slice.as_ref()
else {
return;
};

let LongStructName(AnotherStruct {
multi,
line,
pattern,
}) = multi_line_function_call(
arg1,
arg2,
arg3,
arg4,
) else {
return;
};
}
```

Expand Down