implement @const_eval

closes #73

2 files changed, 14 insertions, 0 deletions

diff --git a/test/run_tests.cpp b/test/run_tests.cpp
index 4d9de75bfa..318ba36f94 100644
--- a/test/run_tests.cpp
+++ b/test/run_tests.cpp
@@ -2020,6 +2020,13 @@ fn func() -> bogus {}
     add_compile_fail_case("bogus compile var", R"SOURCE(
 const x = @compile_var("bogus");
     )SOURCE", 1, ".tmp_source.zig:2:24: error: unrecognized compile variable: 'bogus'");
+
+
+    add_compile_fail_case("@const_eval", R"SOURCE(
+fn a(x: i32) {
+    const y = @const_eval(x);
+}
+    )SOURCE", 1, ".tmp_source.zig:3:27: error: unable to evaluate constant expression");
 }
 
 //////////////////////////////////////////////////////////////////////////////
diff --git a/test/self_hosted.zig b/test/self_hosted.zig
index 86beb173b0..2ea44adaaa 100644
--- a/test/self_hosted.zig
+++ b/test/self_hosted.zig
@@ -233,3 +233,10 @@ fn const_expr_eval_on_single_expr_blocks_fn(x: i32, b: bool) -> i32 {
 
     return result;
 }
+
+
+#attribute("test")
+fn builtin_const_eval() {
+    const x : i32 = @const_eval(1 + 2 + 3);
+    if (x != @const_eval(6)) unreachable{};
+}