parser: Implement variable assignment

This commit introduces variable assignment making it possible to
change a variable value. Example:

  myvar: i32 = 1;
  myvar = 2;

Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>
Co-authored-by: Carlos Maniero <carlos@maniero.me>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/ast.c b/src/ast.c
index 55b65fa..b460f1a 100644
--- a/src/ast.c
+++ b/src/ast.c
@@ -57,6 +57,8 @@ ast_node_destroy(ast_node_t *node)
     case AST_RETURN_STMT:
       ast_node_destroy(node->data.return_stmt.argument);
       break;
+    case AST_VARIABLE_ASSIGNMENT:
+      ast_node_destroy(node->data.variable_assignment.expression);
     case AST_LITERAL:
     case AST_IDENTIFIER:
     case AST_UNKOWN_NODE: