syntax_data: {"ast_node_type":"other","tokens":[{"end":57,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// Subtracts the value only if no unsigned overflow.
context_before:     LLVMAtomicRMWBinOpUDecWrap = 16,
context_after:     LLVMAtomicRMWBinOpUSubCond,