syntax_data: {"ast_node_type":"other","tokens":[{"end":22,"kind":"keyword","start":0,"text":"Err:"}]}
source_snippet:     Err: LLVMErrorRef,
context_before: pub type LLVMOrcExecutionSessionLookupHandleResultFunction = extern "C" fn(
context_after:     Result: LLVMOrcCSymbolMapPairs,