C backend: while, struct tests, better undefined global handling

1. Function signatures that return a no member struct return void
2. Undefined var decls don't get a value generated for them
3. Don't generate bitcast code if the result isn't used, since
   bitcast is a pure function. Right now struct handling code
   generates some weird unused bitcast AIR, and this optimization
   side steps that issue.

1 files changed, 0 insertions, 94 deletions

diff --git a/test/behavior/struct.zig b/test/behavior/struct.zig
index 104fe64b4c..eeaa80ed69 100644
--- a/test/behavior/struct.zig
+++ b/test/behavior/struct.zig
@@ -32,38 +32,6 @@ fn returnEmptyStructInstance() StructWithNoFields {
     return empty_global_instance;
 }
 
-const StructFoo = struct {
-    a: i32,
-    b: bool,
-    c: f32,
-};
-test "structs" {
-    var foo: StructFoo = undefined;
-    @memset(@ptrCast([*]u8, &foo), 0, @sizeOf(StructFoo));
-    foo.a += 1;
-    foo.b = foo.a == 1;
-    try testFoo(foo);
-    testMutation(&foo);
-    try expect(foo.c == 100);
-}
-fn testFoo(foo: StructFoo) !void {
-    try expect(foo.b);
-}
-fn testMutation(foo: *StructFoo) void {
-    foo.c = 100;
-}
-
-test "struct byval assign" {
-    var foo1: StructFoo = undefined;
-    var foo2: StructFoo = undefined;
-
-    foo1.a = 1234;
-    foo2.a = 0;
-    try expect(foo2.a == 0);
-    foo2 = foo1;
-    try expect(foo2.a == 1234);
-}
-
 const Node = struct {
     val: Val,
     next: *Node,
@@ -90,65 +58,3 @@ test "call member function directly" {
     const result = MemberFnTestFoo.member(instance);
     try expect(result == 1234);
 }
-
-test "struct point to self" {
-    var root: Node = undefined;
-    root.val.x = 1;
-
-    var node: Node = undefined;
-    node.next = &root;
-    node.val.x = 2;
-
-    root.next = &node;
-
-    try expect(node.next.next.next.val.x == 1);
-}
-
-test "void struct fields" {
-    const foo = VoidStructFieldsFoo{
-        .a = void{},
-        .b = 1,
-        .c = void{},
-    };
-    try expect(foo.b == 1);
-    try expect(@sizeOf(VoidStructFieldsFoo) == 4);
-}
-const VoidStructFieldsFoo = struct {
-    a: void,
-    b: i32,
-    c: void,
-};
-
-test "member functions" {
-    const r = MemberFnRand{ .seed = 1234 };
-    try expect(r.getSeed() == 1234);
-}
-const MemberFnRand = struct {
-    seed: u32,
-    pub fn getSeed(r: *const MemberFnRand) u32 {
-        return r.seed;
-    }
-};
-
-test "return struct byval from function" {
-    const bar = makeBar2(1234, 5678);
-    try expect(bar.y == 5678);
-}
-const Bar = struct {
-    x: i32,
-    y: i32,
-};
-fn makeBar2(x: i32, y: i32) Bar {
-    return Bar{
-        .x = x,
-        .y = y,
-    };
-}
-
-test "return empty struct from fn" {
-    _ = testReturnEmptyStructFromFn();
-}
-const EmptyStruct2 = struct {};
-fn testReturnEmptyStructFromFn() EmptyStruct2 {
-    return EmptyStruct2{};
-}