Add basic `defer` implementation.

We don't have any closures yet, so it's essentially the same as just
moving the statement after the `defer` keyword to the end of the block/
right before returning from the function.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/parser.c b/src/parser.c
index a0ec7a1..0cd0e5f 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -507,6 +507,10 @@ Node *parse_statement(Lexer *lexer)
         node->loop.body = parse_statement(lexer);
     } else if (token.type == TOKEN_OPEN_BRACE) {
         node = parse_block(lexer);
+    } else if (token.type == TOKEN_DEFER) {
+        Lexer_next(lexer);
+        node = Node_new(AST_DEFER);
+        node->unary_expr = parse_statement(lexer);
     } else {
         // Default to trying to handle it as an expression
         node = parse_expression(lexer);