Struct NullInToml 

pub struct NullInToml { /* private fields */ }

Nulls survived into a document being converted to TOML.

A genuine impossibility in user data, so it is an error rather than a silent drop: the toml crate’s map serializer skips a None entry, so emitting without this check would quietly lose keys.

Carries paths and nothing else — no filenames and no flag names. Naming the layer each null came from would mean retaining every parsed layer past the merge purely for an error path, and the paths alone locate the value in the merged document. The remedies are all interface-shaped — emit JSON instead, substitute a string, or drop the null — so which of them a caller can offer is the caller’s to say, the same division of labour crate::LoadError keeps.

Trait Implementations

impl Debug for NullInToml

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for NullInToml

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Ends without a trailing newline, so a caller can append a help: line of its own — which is what knf-cli does, and why the line is not here.

impl Error for NullInToml

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.