Parse failure after formatting (123).attr or "OK"

[9999years]

We can evaluate this expression:

nix-repl> (123).attr or "OK"
"OK"

Alejandra removes the 'redundant' parenthesis around 123:

-(123).attr or "OK"
+123.attr or "OK"

And then it fails to parse:

$ alejandra number-parens-attr.nix
Failed! 1 error found at:
- number-parens-attr.nix: error node at 0..4

This is because (123).attr parses as "the attr attribute of 123" and 123.attr parses as "the value of the attr variable applied to the function 123.":

$ nix-instantiate --parse --expr 'let attr = 1; in 123.attr'
(let attr = 1; in (123 attr))
$ nix-instantiate --parse --expr 'let attr = 1; in (123).attr'
(let attr = 1; in (123).attr)

Version information:

$ alejandra --version
Alejandra 3.0.0