Function parse_str 

pub fn parse_str(span: Span, input: &str) -> Result<Type<'_>, ParseError>

Parses a string representation of a PHPDoc type into an Abstract Syntax Tree (AST).

This is the main entry point for the type parser. It takes the type string and its original Span (representing its location within the source file) and returns the parsed Type AST or a ParseError.

Arguments

• span - The original Span of the input string slice within its source file. This is crucial for ensuring all AST nodes have correct, absolute positioning.
• input - The &str containing the type string to parse (e.g., "int|string", "array<int, MyClass>").

Errors

Returns a ParseError if any lexing or parsing error occurs.