pub const MAX_NESTING: usize = 256;Expand description
How deeply brackets may nest before the parser gives up.
Recursive descent uses the machine stack for the grammar’s nesting, so a file with a
thousand open parentheses is a stack overflow rather than a diagnostic unless something
stops it. The number is clang’s -fbracket-depth default, which is the one real code has
been measured against, and it is far above anything a human writes and far below anything
that costs the stack more than a fraction of a megabyte.