fix

src/ledger/database/lmdb.zig

@@ -428,7 +428,7 @@ fn resetTxnFree(ctx: *anyopaque, _: []u8, _: u8, _: usize) void {
 /// ```
 fn returnOutput(fn_with_output: anytype, args: anytype) LmdbError!OutputType(fn_with_output) {
     // create a local variable to hold the function's output.
-    const MaybeOutput = LastParam(fn_with_output).Pointer.child;
+    const MaybeOutput = LastParamChild(fn_with_output);
     var maybe_output: MaybeOutput = switch (@typeInfo(MaybeOutput)) {
         .Optional => null,
         .Int => 0,
@@ -449,17 +449,18 @@ fn returnOutput(fn_with_output: anytype, args: anytype) LmdbError!OutputType(fn_
 /// For an LMDB function that provides its output by writing to a pointer, this
 /// is the data type of the output.
 fn OutputType(fn_with_output: anytype) type {
-    const InnerType = LastParam(fn_with_output).Pointer.child;
+    const InnerType = LastParamChild(fn_with_output);
     return switch (@typeInfo(InnerType)) {
         .Optional => |o| o.child,
         else => InnerType,
     };
 }
 
-/// Returns the type of the last parameter of a function.
-fn LastParam(function: anytype) type {
+/// Returns the child type of the last parameter of a function,
+/// assuming that parameter is a pointer.
+fn LastParamChild(function: anytype) type {
     const params = @typeInfo(@TypeOf(function)).Fn.params;
-    return @typeInfo(params[params.len - 1].type.?);
+    return @typeInfo(params[params.len - 1].type.?).Pointer.child;
 }
 
 fn cursorGet(