5.2 Precedence and associativity

Level	Operators	Associativity
15	`f()` `a[i]` `a.b` `a?.b` `e?` `e!`	left (postfix)
14	`-e` `!e` `~e` `&e` `&var e` `move e` `await e`	prefix
13	`as` `is`	left
12	`**`	right
11	`* / % % \|`	left
10	`+ - +% -% +\| -\|`	left
9	`<< >>`	left
8	`&`	left
7	`^`	left
6	`\|`	left
5	`..` `..=`	none
4	`== != < <= > >= <=> in`	none (`a < b < c` is an error)
3	`&&`	left
2	`\|\|`	left
1	`??`	right
0	`\|>`	left
−1	`->` `?->` `~>` `!>` and the suffixes `within`, `retry`	left
−2	`=>` (lambda)	right

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