idl: Fix panicking on tests #3197
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Problem
The IDL generation has an optional type alias resolution feature that parses the crate code starting from the crate's root (
lib.rs). The current code simply uses.expectbecause it's expected that all Solana programs have this file, but if there is atestsfolder inside the program directory, this code panics:https://github.com/coral-xyz/anchor/blob/679c1306f39f529bebf72b4f4d2bfa4a54b633c4/lang/syn/src/idl/defined.rs#L500
Summary of changes
Fix panicking when
lib.rsfile doesn't exist.