步骤1：VAR_TEMP 词法+语法支持（token/关键字/VarSection::Temp/保留字放行）+ 测试

tests/src/lexer_test.cpp

@@ -197,7 +197,18 @@ static bool test_line1() {
     return true;
 }
 
+static bool test_var_temp_kw() {
+    using namespace compiler;
+    std::vector<Token> ts;
+    std::string err;
+    CHECK(lex("t.st", "VAR_TEMP", &ts, &err));
+    CHECK(!ts.empty());
+    CHECK(ts[0].type == Tok::VAR_TEMP);
+    return true;
+}
+
 int main() {
+    if (!test_var_temp_kw()) return 1;
     if (!test_basic()) return 1;
     if (!test_case()) return 1;
     if (!test_symbols()) return 1;

tests/src/parser_test.cpp

@@ -289,7 +289,38 @@ static bool test_negative() {
     return true;
 }
 
+// ---- VAR_TEMP 段：解析为 VarSection::Temp ----
+
+static bool test_var_temp() {
+    using namespace compiler;
+    Unit u;
+    std::string err;
+    CHECK(parse_pous("t.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",
+                     &u, &err));
+    CHECK(u.pous.size() == 1);
+    const POU& p = u.pous[0];
+    CHECK(p.kind == PouKind::FunctionBlock);
+    CHECK(p.blocks.size() == 4);
+    CHECK(p.blocks[0].section == VarSection::Input);
+    CHECK(p.blocks[1].section == VarSection::Output);
+    CHECK(p.blocks[2].section == VarSection::Local);
+    CHECK(p.blocks[3].section == VarSection::Temp);
+    CHECK(p.blocks[3].vars.size() == 1);
+    CHECK(p.blocks[3].vars[0].name == "tmp");
+    CHECK(p.blocks[3].vars[0].type.kind == TypeKind::Scalar);
+    CHECK(p.blocks[3].vars[0].type.name == "int");
+    return true;
+}
+
 int main() {
+    if (!test_var_temp()) return 1;
     if (!test_gvl_file()) return 1;
     if (!test_fb()) return 1;
     if (!test_program()) return 1;