fix: build error for zig 0.12.0-dev.1664, replaced 'var' with 'const'

Author: davidgranstrom

src/ziglua-5.1/lib.zig

@@ -300,7 +300,7 @@ pub const Lua = struct {
     pub fn init(allocator: Allocator) !Lua {
         // the userdata passed to alloc needs to be a pointer with a consistent address
         // so we allocate an Allocator struct to hold a copy of the allocator's data
-        var allocator_ptr = allocator.create(Allocator) catch return error.Memory;
+        const allocator_ptr = allocator.create(Allocator) catch return error.Memory;
         allocator_ptr.* = allocator;
 
         const state = c.lua_newstate(alloc, allocator_ptr) orelse return error.Memory;

src/ziglua-5.1/tests.zig

@@ -568,7 +568,7 @@ test "dump and load" {
     const reader = struct {
         fn inner(l: *Lua, data: *anyopaque) ?[]const u8 {
             _ = l;
-            var arr = ziglua.opaqueCast(std.ArrayList(u8), data);
+            const arr = ziglua.opaqueCast(std.ArrayList(u8), data);
             return arr.items;
         }
     }.inner;

src/ziglua-5.2/lib.zig

@@ -330,7 +330,7 @@ pub const Lua = struct {
     pub fn init(allocator: Allocator) !Lua {
         // the userdata passed to alloc needs to be a pointer with a consistent address
         // so we allocate an Allocator struct to hold a copy of the allocator's data
-        var allocator_ptr = allocator.create(Allocator) catch return error.Memory;
+        const allocator_ptr = allocator.create(Allocator) catch return error.Memory;
         allocator_ptr.* = allocator;
 
         const state = c.lua_newstate(alloc, allocator_ptr) orelse return error.Memory;

src/ziglua-5.2/tests.zig

@@ -673,7 +673,7 @@ test "dump and load" {
     const reader = struct {
         fn inner(l: *Lua, data: *anyopaque) ?[]const u8 {
             _ = l;
-            var arr = ziglua.opaqueCast(std.ArrayList(u8), data);
+            const arr = ziglua.opaqueCast(std.ArrayList(u8), data);
             return arr.items;
         }
     }.inner;

src/ziglua-5.3/lib.zig

@@ -348,7 +348,7 @@ pub const Lua = struct {
         // the userdata passed to alloc needs to be a pointer with a consistent address
         // so we allocate an Allocator struct to hold a copy of the allocator's data
         // TODO: could we just pass a pointer to the init function?
-        var allocator_ptr = allocator.create(Allocator) catch return error.Memory;
+        const allocator_ptr = allocator.create(Allocator) catch return error.Memory;
         allocator_ptr.* = allocator;
 
         const state = c.lua_newstate(alloc, allocator_ptr) orelse return error.Memory;

src/ziglua-5.3/tests.zig

@@ -581,7 +581,7 @@ test "extra space" {
     var lua = try Lua.init(testing.allocator);
     defer lua.deinit();
 
-    var space: *align(1) usize = @ptrCast(lua.getExtraSpace().ptr);
+    const space: *align(1) usize = @ptrCast(lua.getExtraSpace().ptr);
     space.* = 1024;
     // each new thread is initialized with a copy of the extra space from the main thread
     var thread = lua.newThread();
@@ -714,7 +714,7 @@ test "dump and load" {
     const reader = struct {
         fn inner(l: *Lua, data: *anyopaque) ?[]const u8 {
             _ = l;
-            var arr = ziglua.opaqueCast(std.ArrayList(u8), data);
+            const arr = ziglua.opaqueCast(std.ArrayList(u8), data);
             return arr.items;
         }
     }.inner;

src/ziglua-5.4/lib.zig

@@ -351,7 +351,7 @@ pub const Lua = struct {
     pub fn init(allocator: Allocator) !Lua {
         // the userdata passed to alloc needs to be a pointer with a consistent address
         // so we allocate an Allocator struct to hold a copy of the allocator's data
-        var allocator_ptr = allocator.create(Allocator) catch return error.Memory;
+        const allocator_ptr = allocator.create(Allocator) catch return error.Memory;
         allocator_ptr.* = allocator;
 
         const state = c.lua_newstate(alloc, allocator_ptr) orelse return error.Memory;
@@ -2122,7 +2122,7 @@ fn wrapZigWarnFn(comptime f: ZigWarnFn) CWarnFn {
     return struct {
         fn inner(data: ?*anyopaque, msg: [*c]const u8, to_cont: c_int) callconv(.C) void {
             // warning messages emitted from Lua should be null-terminated for display
-            var message = std.mem.span(@as([*:0]const u8, @ptrCast(msg)));
+            const message = std.mem.span(@as([*:0]const u8, @ptrCast(msg)));
             @call(.always_inline, f, .{ data, message, to_cont != 0 });
         }
     }.inner;

src/ziglua-5.4/tests.zig

@@ -622,7 +622,7 @@ test "extra space" {
     var lua = try Lua.init(testing.allocator);
     defer lua.deinit();
 
-    var space: *align(1) usize = @ptrCast(lua.getExtraSpace().ptr);
+    const space: *align(1) usize = @ptrCast(lua.getExtraSpace().ptr);
     space.* = 1024;
     // each new thread is initialized with a copy of the extra space from the main thread
     var thread = lua.newThread();
@@ -755,7 +755,7 @@ test "dump and load" {
     const reader = struct {
         fn inner(l: *Lua, data: *anyopaque) ?[]const u8 {
             _ = l;
-            var arr = ziglua.opaqueCast(std.ArrayList(u8), data);
+            const arr = ziglua.opaqueCast(std.ArrayList(u8), data);
             return arr.items;
         }
     }.inner;