Function load_dotenv 

pub fn load_dotenv()

Load environment variables from .env file if present.

This function:

• Searches for .env in current directory and up to 2 parent directories
• Only sets variables that aren’t already set (env vars take precedence)
• Is idempotent - safe to call multiple times
• Returns silently if no .env file is found

Example

anno::env::load_dotenv();