it's sometimes useful to get source_code as string back if we need to convert miette report to other diagnostic info like vscode lsp format, but it seems impossible to get it back, so it seems we need to wrap our own diagnostic to save source_code, but I'm not sure it's a good practice
struct MyDiagnostic{inner: Arc<miette::Report>,source_code: Arc<src>}it's sometimes useful to get source_code as string back if we need to convert miette report to other diagnostic info like vscode lsp format, but it seems impossible to get it back, so it seems we need to wrap our own diagnostic to save source_code, but I'm not sure it's a good practice
```rs
struct MyDiagnostic {
inner: Arc<miette::Report>,
source_code: Arc<src>
}
```