pub fn required_str<'a>(
map: &'a Expr,
name: &str,
context: &str,
) -> Result<&'a str>Expand description
Read a required string-valued field, with a context label for diagnostics.
This is the one home for the string_field/required_field-style readers
that coerce to &str; callers wanting a domain-specific error keep a thin
local wrapper. Accepts either key form, matching field_any.