Variable labeling of complex match arms should be able to label the whole arm #15219
Description
If I have a match arm like this:
0x2A | 0x2D | 0x2E | 0x30 .. 0x39 | 0x41 .. 0x5A | 0x5F | 0x61..0x7A => {}
the following does not work:
a @ 0x2A | 0x2D | 0x2E | 0x30 .. 0x39 | 0x41 .. 0x5A | 0x5F | 0x61..0x7A => {println("{}",a)}
a @ (0x2A | 0x2D | 0x2E | 0x30 .. 0x39 | 0x41 .. 0x5A | 0x5F | 0x61..0x7A) => {println("{}",a)}
In the former example, the a is bound to the first literal only, and in the latter the compiler thinks that it is a tuple (and complains about the lack of commas).
Of course, one can do
a @ 0x2A | a @ 0x2D | a@ 0x2E | a@ 0x30 .. 0x39 /* etc */=> {println("{}",a)}
but that is cumbersome.
Could we get a way to easily bind a variable to the entire match arm?