Function literal_expr 

pub fn literal_expr(lit: &Literal) -> Result<Expr>

Converts one syntax literal into retained expression syntax without executing code.

Preserves the token’s source span and concrete numeric width using the same validation as expression parsing.

Errors

Rejects unsupported literal kinds, invalid suffixes, and out-of-range values.

• Complexity: O(n) literal bytes.

Examples

let token: syn::Lit = syn::parse_str("42i32")?;
assert!(matches!(cel_parser::literal_expr(&token)?,
    cel_parser::Expr::Literal { value: cel_parser::Literal::I32(42), .. }));