diff --git a/src/ast_printer.zig b/src/ast_printer.zig
index ae1a9b7..a1fc7ea 100644
--- a/src/ast_printer.zig
+++ b/src/ast_printer.zig
@@ -14,9 +14,9 @@ fn parenthesize(name: []const u8, exprs: []*ast.Expr) void {
 
 pub fn printAst(ast_expr: *ast.Expr) void {
     switch (ast_expr.*) {
-        .Binary => |expr| parenthesize(expr.operator.lexeme, &[]*ast.Expr{ expr.left, expr.right }),
-        .Grouping => |expr| parenthesize("group", &[]*ast.Expr{expr.expression}),
-        .Unary => |expr| parenthesize(expr.operator.lexeme, &[]*ast.Expr{expr.right}),
+        .Binary => |expr| parenthesize(expr.operator.lexeme, &[_]*ast.Expr{ expr.left, expr.right }),
+        .Grouping => |expr| parenthesize("group", &[_]*ast.Expr{expr.expression}),
+        .Unary => |expr| parenthesize(expr.operator.lexeme, &[_]*ast.Expr{expr.right}),
         .Number => |ast_num| {
             switch (ast_num) {
                 .Integer32 => |num| std.debug.warn("{}", num),
diff --git a/src/main.zig b/src/main.zig
index 96c4c58..bc07abc 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -67,8 +67,7 @@ fn runPrompt(allocator: *Allocator) !void {
 }
 
 pub fn main() anyerror!void {
-    var da = std.heap.DirectAllocator.init();
-    var arena = std.heap.ArenaAllocator.init(&da.allocator);
+    var arena = std.heap.ArenaAllocator.init(std.heap.direct_allocator);
     defer arena.deinit();
     var allocator = &arena.allocator;
 
diff --git a/src/parser.zig b/src/parser.zig
index 2e84369..127a34d 100644
--- a/src/parser.zig
+++ b/src/parser.zig
@@ -108,7 +108,7 @@ pub const Parser = struct {
     fn equality(self: *Parser) !Expr {
         var expr = try self.comparison();
 
-        while (self.match(&[]TokenType{ TokenType.BangEqual, TokenType.EqualEqual })) {
+        while (self.match(&[_]TokenType{ TokenType.BangEqual, TokenType.EqualEqual })) {
             var operator = self.previous();
             var right = try self.comparison();
 
@@ -121,7 +121,7 @@ pub const Parser = struct {
     fn comparison(self: *Parser) !Expr {
         var expr = try self.addition();
 
-        while (self.match(&[]TokenType{
+        while (self.match(&[_]TokenType{
             TokenType.Greater,
             TokenType.GreaterEqual,
             TokenType.Less,
@@ -138,7 +138,7 @@ pub const Parser = struct {
     fn addition(self: *Parser) !Expr {
         var expr = try self.multiplication();
 
-        while (self.match(&[]TokenType{ TokenType.Minus, TokenType.Plus })) {
+        while (self.match(&[_]TokenType{ TokenType.Minus, TokenType.Plus })) {
             var operator = self.previous();
             var right = try self.multiplication();
             expr = ast.mkBinary(&expr, operator, &right);
@@ -150,7 +150,7 @@ pub const Parser = struct {
     fn multiplication(self: *Parser) anyerror!Expr {
         var expr = try self.unary();
 
-        while (self.match(&[]TokenType{ TokenType.Slash, TokenType.Star })) {
+        while (self.match(&[_]TokenType{ TokenType.Slash, TokenType.Star })) {
             var operator = self.previous();
             var right = try self.unary();
             expr = ast.mkBinary(&expr, operator, &right);
@@ -160,7 +160,7 @@ pub const Parser = struct {
     }
 
     fn unary(self: *Parser) anyerror!Expr {
-        if (self.match(&[]TokenType{ TokenType.Bang, TokenType.Minus })) {
+        if (self.match(&[_]TokenType{ TokenType.Bang, TokenType.Minus })) {
             var operator = self.previous();
             var right = try self.unary();
             return ast.mkUnary(operator, &right);
diff --git a/src/scanner.zig b/src/scanner.zig
index 94faf6b..491f1f2 100644
--- a/src/scanner.zig
+++ b/src/scanner.zig
@@ -24,7 +24,7 @@ fn isAlphaNumeric(char: u8) bool {
     return isAlpha(char) or isDigit(char);
 }
 
-const keywords = [][]const u8{
+const keywords = [_][]const u8{
     "break",
     "const",
     "continue",
@@ -51,7 +51,7 @@ const keywords = [][]const u8{
     "None",
 };
 
-const keyword_ttypes = []TokenType{
+const keyword_ttypes = [_]TokenType{
     .Break,
     .Const,
     .Continue,