Fix off-by-one if statement jump error

source/ona/kym.zig

@@ -272,16 +272,15 @@ pub const RuntimeEnv = struct {
 						try self.compile_expression(chunk, @"if".condition_expression);
 						try chunk.opcodes.push_one(.{.jf = 0});
 
-						const jump_opcode = &chunk.opcodes.values[chunk.opcodes.values.len - 1];
+						const jump_opcode_index = chunk.opcodes.values.len - 1;
 
 						for (@"if".block_statements.values) |block_statement| {
 							try self.compile_statement(chunk, block_statement);
 						}
 
-						coral.debug.assert(jump_opcode.* == .jf);
 						coral.debug.assert(chunk.opcodes.values.len < coral.math.max_int(@typeInfo(u32).Int));
 
-						jump_opcode.jf = @intCast(chunk.opcodes.values.len);
+						chunk.opcodes.values[jump_opcode_index].jf = @intCast(chunk.opcodes.values.len - 1);
 					},
 
 					.expression => |expression| try self.compile_expression(chunk, expression),
@@ -422,15 +421,11 @@ pub const RuntimeEnv = struct {
 					},
 
 					.object_get => {
-						const index = (try self.pop_local()) orelse {
+						const index = try self.env.expect(try self.pop_local());
-							return self.env.raise(error.TypeMismatch, "nil is not a valid index");
-						};
 
 						defer self.env.discard(index);
 
-						const indexable = (try self.pop_local()) orelse {
+						const indexable = try self.env.expect(try self.pop_local());
-							return self.env.raise(error.TypeMismatch, "nil is not a valid indexable");
-						};
 
 						defer self.env.discard(indexable);
 
@@ -1554,6 +1549,21 @@ pub const RuntimeRef = opaque {
 			.dynamic => true,
 		};
 	}
+
+	pub fn typename(self: *const RuntimeRef) []const coral.io.Byte {
+		return switch (self.object().payload) {
+			.false => "false",
+			.true => "true",
+			.float => "float",
+			.fixed => "fixed",
+			.symbol => "symbol",
+			.vector2 => "vector2",
+			.vector3 => "vector3",
+			.syscall => "syscall",
+			.string => "string",
+			.dynamic => "dynamic",
+		};
+	}
 };
 
 pub const Syscall = fn (env: *RuntimeEnv) RuntimeError!?*RuntimeRef;