typedef struct
{
  UINT nStructSize;
  RECEIVER_TYPE eRecvType;	/* recevier type to claim handle from */
  WORD wUserId;				/* user claiming handle */
  const tekhandle_type *ahHandle;	/* the user can specify a specific handle (0 indicates any handle)
                                  or an array of sub-handles for a virtual handle*/
  int iClaimNum;				/* the number of actual physical handles needed for a virtual handle
                        use 1 when claiming a single physical handle*/
  BOOL bLock;					/* claim the handle for exclusive use */
  USERDATA UserData;			/* user notification data */
  tekmap_type hMap;			/* map being used with this handle */
  MAP_REDUCTION MapReduct;    /* map reduction to use (if supported by handle) */
} CLAIMPARAMS;

clang-format asserts while formatting the above code.
Both Visual Studio plugin and standalone clang-format.exe based on SVN r223387 do this.