IOBuffer resource leak in compile_rust_to_llvm_ir error paths

[terasakisatoshi]

Bug Description

In compile_rust_to_llvm_ir() in compiler.jl, IOBuffer objects are not properly closed in error paths, leading to resource leaks.

Location

• src/compiler.jl (compile_rust_to_llvm_ir function)

Problem

When compilation errors occur, IOBuffers used for capturing stderr/stdout are not explicitly closed before the error is thrown. While Julia's GC will eventually clean these up, repeated compilation failures could accumulate unclosed IOBuffer resources.

Suggested Fix

Use try-finally to ensure IOBuffers are closed:

buf = IOBuffer()
try
    # ... compilation logic
finally
    close(buf)
end

Severity

LOW - Resource leak in error paths

[terasakisatoshi]

Fixed in commit f109039 (#208)