Clarify "meta" submodule doc comment and tidy up Function type

.vscode/launch.json

@@ -27,7 +27,7 @@
 			"arguments": "main.zig",
 			"cwd": "${workspaceRoot}",
 			"valuesFormatting": "parseText",
-			"preLaunchTask": "Build Test",
+			"preLaunchTask": "Build Tests",
 		},
 	]
 }

src/core/main.zig

@@ -5,7 +5,7 @@
 pub const io = @import("./io.zig");
 
 ///
-/// Metaprogramming introspection utilities
+/// Metaprogramming introspection and generation utilities.
 ///
 pub const meta = @import("./meta.zig");
 

src/core/meta.zig

@@ -12,13 +12,12 @@ pub fn FnReturn(comptime Fn: type) type {
 }
 
 ///
-/// Returns a single-input single-output closure type where `Input` represents the input type,
+/// Returns a single-input single-output closure type where `In` represents the input type, `Out`
-/// `Output` represents the output type, and `captures_size` represents the size of the closure
+/// represents the output type, and `captures_size` represents the size of the closure context.
-/// context.
 ///
-pub fn Function(comptime captures_size: usize, comptime Input: type, comptime Output: type) type {
+pub fn Function(comptime captures_size: usize, comptime In: type, comptime Out: type) type {
     return struct {
-        applyErased: fn (*anyopaque, Input) Output,
+        applyErased: fn (*anyopaque, In) Out,
         context: [captures_size]u8,
 
         ///
@@ -29,7 +28,7 @@ pub fn Function(comptime captures_size: usize, comptime Input: type, comptime Ou
         ///
         /// Applies `input` to `self`, producing a result according to the current context data.
         ///
-        pub fn apply(self: *Self, input: Input) Output {
+        pub fn apply(self: *Self, input: In) Out {
             return self.applyErased(&self.context, input);
         }
 
@@ -39,7 +38,7 @@ pub fn Function(comptime captures_size: usize, comptime Input: type, comptime Ou
         ///
         /// The newly created [Self] is returned.
         ///
-        pub fn capture(captures: anytype, comptime call: fn (@TypeOf(captures), Input) Output) Self {
+        pub fn capture(captures: anytype, comptime call: fn (@TypeOf(captures), In) Out) Self {
             const Captures = @TypeOf(captures);
 
             if (@sizeOf(Captures) > captures_size)
@@ -52,7 +51,7 @@ pub fn Function(comptime captures_size: usize, comptime Input: type, comptime Ou
                 .context = undefined,
 
                 .applyErased = struct {
-                    fn do(erased: *anyopaque, input: Input) Output {
+                    fn do(erased: *anyopaque, input: In) Out {
                         return call(@ptrCast(*Captures, @alignCast(
                             captures_align, erased)).*, input);
                     }

src/tests.zig

@@ -1,5 +1,5 @@
 test {
-    _ = @import("./engine/main.zig");
+    _ = @import("./core/main.zig");
     _ = @import("./oar/main.zig");
     _ = @import("./ona/main.zig");
 }