add compile error for function prototype with no body

closes #1231

1 files changed, 7 insertions, 0 deletions

diff --git a/src/analyze.cpp b/src/analyze.cpp
index ccab9170e9..405e010ba4 100644
--- a/src/analyze.cpp
+++ b/src/analyze.cpp
@@ -3242,6 +3242,13 @@ static void add_top_level_decl(CodeGen *g, ScopeDecls *decls_scope, Tld *tld) {
     } else if (tld->id == TldIdFn) {
         assert(tld->source_node->type == NodeTypeFnProto);
         is_export = tld->source_node->data.fn_proto.is_export;
+
+        if (!is_export && !tld->source_node->data.fn_proto.is_extern &&
+            tld->source_node->data.fn_proto.fn_def_node == nullptr)
+        {
+            add_node_error(g, tld->source_node, buf_sprintf("non-extern function has no body"));
+            return;
+        }
     }
     if (is_export) {
         g->resolve_queue.append(tld);