Do not close nil stream when it failed to open
#87
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When stream fails to open during loading of TOML file, `stream` remains set to `nil`. The `finally` block then triggers SIGSEGV when it tries to close the stream that was never fully opened. Only install the `finally` block once `stream` was initialized to fix this.
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When stream fails to open during loading of TOML file,
streamremains set tonil. Thefinallyblock then triggers SIGSEGV when it tries to close the stream that was never fully opened. Only install thefinallyblock oncestreamwas initialized to fix this.