步骤2：VAR_TEMP 链接层（FB 布局排除 Temp 字段 + 顶层防御校验 + scope 符号映射 Local）+ linker_test

tests/src/linker_test.cpp

@@ -70,6 +70,67 @@ static bool expect_link_err(const char* dir, const char* keyword) {
     return true;
 }
 
+// ---- 0. VAR_TEMP：FB 布局排除 Temp、scope 符号为 Local ----
+
+static bool test_var_temp() {
+    using namespace compiler;
+    const std::string toml = std::string(REPO_ROOT) + "/tests/cases/13_function_call/project.toml";
+    Project p;
+    std::string err;
+    CHECK(parse_project(toml, &p, &err));
+    SourceUnit u;
+    u.path = "main.st";
+    CHECK(parse_pous("main.st",
+                     "FUNCTION_BLOCK Foo\n"
+                     "VAR_INPUT\n  in : BOOL;\nEND_VAR\n"
+                     "VAR_OUTPUT\n  out : BOOL;\nEND_VAR\n"
+                     "VAR\n  state : BOOL;\nEND_VAR\n"
+                     "VAR_TEMP\n  tmp : INT;\nEND_VAR\n"
+                     "  out := tmp > 0;\n"
+                     "END_FUNCTION_BLOCK\n"
+                     "PROGRAM MAIN\nEND_PROGRAM",
+                     &u.ast, &err));
+    compiler::MachineConfig cfg;
+    std::string cerr;
+    CHECK(cfg.load(std::string(REPO_ROOT) + "/compiler/machine.toml", &cerr));
+    LinkResult r;
+    std::vector<SourceUnit> units;
+    units.push_back(std::move(u));
+    CHECK(link_project(p, units, cfg, &r, &err));
+
+    // FB 布局：字段 = input/output/内部 var，VAR_TEMP 不是字段
+    const auto it = r.fb_types.find("foo");
+    CHECK(it != r.fb_types.end());
+    CHECK(it->second.fields.size() == 3);
+    CHECK(it->second.fields[0].name == "in");
+    CHECK(it->second.fields[1].name == "out");
+    CHECK(it->second.fields[2].name == "state");
+    for (const FbField& f : it->second.fields) {
+        CHECK(f.name != "tmp");
+    }
+
+    // scope 符号：VAR_TEMP → Local（在 Foo 作用域）
+    bool saw_tmp = false;
+    bool saw_main = false;
+    for (const auto& sc : r.scopes) {
+        if (sc.name == "foo") {
+            for (const Symbol& s : sc.syms) {
+                if (s.name == "tmp") {
+                    saw_tmp = true;
+                    CHECK(s.kind == SymbolKind::Local);
+                    CHECK(s.type_name == "int");
+                }
+            }
+        }
+        if (sc.name == "main") {
+            saw_main = true;
+        }
+    }
+    CHECK(saw_tmp);
+    CHECK(saw_main);
+    return true;
+}
+
 // ---- 1. 用例 09：GVL + VAR_EXTERNAL 同一槽 ----
 
 static bool test_case09() {
@@ -229,6 +290,7 @@ static bool test_builtin() {
 }
 
 int main() {
+    if (!test_var_temp()) return 1;
     if (!test_case09()) return 1;
     if (!test_neg_cases()) return 1;
     if (!test_case16()) return 1;