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panic! in append.rs:113 on generic functions #21

Description

@unineko5555

append.rs:113 panics on type argument conflicts when fuzzing generic functions like deposit<MarketType, CoinType>.

thread 'main' panicked at 'Conflicting type arguments for index 0',
crates/movy-fuzz/src/mutators/sequence/append.rs:113:21

The same conflict is handled gracefully elsewhere in the file (PartialFound branch) with return None. Suggested fix:

// panic!("Conflicting type arguments for index {}", i);
debug!("Conflicting type arguments for index {}, skipping", i);
return None;

Workaround: --exclude-modules to skip generic modules.

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