Added more tests

src/build/ast/Parse.go

@@ -61,7 +61,7 @@ func toASTNode(tokens token.List) (Node, error) {
 	switch {
 	case IsVariableDefinition(expr):
 		if len(expr.Children) < 2 {
-			return nil, errors.New(errors.MissingAssignValue, nil, expr.Token.End())
+			return nil, errors.New(errors.MissingOperand, nil, expr.Token.End())
 		}
 
 		name := expr.Children[0].Token
@@ -70,7 +70,7 @@ func toASTNode(tokens token.List) (Node, error) {
 
 	case IsAssignment(expr):
 		if len(expr.Children) < 2 {
-			return nil, errors.New(errors.MissingAssignValue, nil, expr.Token.End())
+			return nil, errors.New(errors.MissingOperand, nil, expr.Token.End())
 		}
 
 		name := expr.Children[0].Token

src/build/core/ExpressionToRegister.go

@@ -4,6 +4,7 @@ import (
 	"git.akyoto.dev/cli/q/src/build/asm"
 	"git.akyoto.dev/cli/q/src/build/ast"
 	"git.akyoto.dev/cli/q/src/build/cpu"
+	"git.akyoto.dev/cli/q/src/build/errors"
 	"git.akyoto.dev/cli/q/src/build/expression"
 )
 
@@ -23,6 +24,10 @@ func (f *Function) ExpressionToRegister(node *expression.Expression, register cp
 		return err
 	}
 
+	if len(node.Children) < 2 {
+		return errors.New(errors.MissingOperand, f.File, node.Token.End())
+	}
+
 	left := node.Children[0]
 	right := node.Children[1]
 	final := register

src/build/errors/CompileErrors.go

@@ -3,7 +3,7 @@ package errors
 var (
 	InvalidStatement    = &Base{"Invalid statement"}
 	InvalidExpression   = &Base{"Invalid expression"}
-	MissingAssignValue  = &Base{"Missing assignment value"}
+	MissingOperand      = &Base{"Missing operand"}
 	MissingMainFunction = &Base{"Missing main function"}
 	NotImplemented      = &Base{"Not implemented"}
 )