stage2: move some tests which are now passing

Author: Snektron

test/behavior.zig

@@ -58,6 +58,7 @@ test {
         _ = @import("behavior/floatop.zig");
         _ = @import("behavior/fn.zig");
         _ = @import("behavior/for.zig");
+        _ = @import("behavior/generics_llvm.zig");
         _ = @import("behavior/math.zig");
         _ = @import("behavior/maximum_minimum.zig");
         _ = @import("behavior/null_llvm.zig");
@@ -145,7 +146,6 @@ test {
             _ = @import("behavior/fn_delegation.zig");
             _ = @import("behavior/fn_in_struct_in_comptime.zig");
             _ = @import("behavior/for_stage1.zig");
-            _ = @import("behavior/generics_stage1.zig");
             _ = @import("behavior/if_stage1.zig");
             _ = @import("behavior/import.zig");
             _ = @import("behavior/incomplete_struct_param_tld.zig");

test/behavior/cast.zig

@@ -266,3 +266,32 @@ test "array coersion to undefined at runtime" {
     array = undefined;
     try expect(std.mem.eql(u8, &array, &undefined_val));
 }
+
+test "implicitly cast from int to anyerror!?T" {
+    implicitIntLitToOptional();
+    comptime implicitIntLitToOptional();
+}
+fn implicitIntLitToOptional() void {
+    const f: ?i32 = 1;
+    _ = f;
+    const g: anyerror!?i32 = 1;
+    _ = g catch {};
+}
+
+test "return u8 coercing into ?u32 return type" {
+    const S = struct {
+        fn doTheTest() !void {
+            try expect(foo(123).? == 123);
+        }
+        fn foo(arg: u8) ?u32 {
+            return arg;
+        }
+    };
+    try S.doTheTest();
+    comptime try S.doTheTest();
+}
+
+test "cast from ?[*]T to ??[*]T" {
+    const a: ??[*]u8 = @as(?[*]u8, null);
+    try expect(a != null and a.? == null);
+}

test/behavior/cast_llvm.zig

@@ -65,3 +65,135 @@ test "implicit ptr to *c_void" {
     var c: *u32 = @ptrCast(*u32, ptr2.?);
     try expect(c.* == 1);
 }
+
+const A = struct {
+    a: i32,
+};
+test "return null from fn() anyerror!?&T" {
+    const a = returnNullFromOptionalTypeErrorRef();
+    const b = returnNullLitFromOptionalTypeErrorRef();
+    try expect((try a) == null and (try b) == null);
+}
+fn returnNullFromOptionalTypeErrorRef() anyerror!?*A {
+    const a: ?*A = null;
+    return a;
+}
+fn returnNullLitFromOptionalTypeErrorRef() anyerror!?*A {
+    return null;
+}
+
+test "peer type resolution: [0]u8 and []const u8" {
+    try expect(peerTypeEmptyArrayAndSlice(true, "hi").len == 0);
+    try expect(peerTypeEmptyArrayAndSlice(false, "hi").len == 1);
+    comptime {
+        try expect(peerTypeEmptyArrayAndSlice(true, "hi").len == 0);
+        try expect(peerTypeEmptyArrayAndSlice(false, "hi").len == 1);
+    }
+}
+fn peerTypeEmptyArrayAndSlice(a: bool, slice: []const u8) []const u8 {
+    if (a) {
+        return &[_]u8{};
+    }
+
+    return slice[0..1];
+}
+
+test "implicitly cast from [N]T to ?[]const T" {
+    try expect(mem.eql(u8, castToOptionalSlice().?, "hi"));
+    comptime try expect(mem.eql(u8, castToOptionalSlice().?, "hi"));
+}
+
+fn castToOptionalSlice() ?[]const u8 {
+    return "hi";
+}
+
+test "cast u128 to f128 and back" {
+    comptime try testCast128();
+    try testCast128();
+}
+
+fn testCast128() !void {
+    try expect(cast128Int(cast128Float(0x7fff0000000000000000000000000000)) == 0x7fff0000000000000000000000000000);
+}
+
+fn cast128Int(x: f128) u128 {
+    return @bitCast(u128, x);
+}
+
+fn cast128Float(x: u128) f128 {
+    return @bitCast(f128, x);
+}
+
+test "implicit cast from *[N]T to ?[*]T" {
+    var x: ?[*]u16 = null;
+    var y: [4]u16 = [4]u16{ 0, 1, 2, 3 };
+
+    x = &y;
+    try expect(std.mem.eql(u16, x.?[0..4], y[0..4]));
+    x.?[0] = 8;
+    y[3] = 6;
+    try expect(std.mem.eql(u16, x.?[0..4], y[0..4]));
+}
+
+test "implicit cast from *T to ?*c_void" {
+    var a: u8 = 1;
+    incrementVoidPtrValue(&a);
+    try std.testing.expect(a == 2);
+}
+
+fn incrementVoidPtrValue(value: ?*c_void) void {
+    @ptrCast(*u8, value.?).* += 1;
+}
+
+test "implicit cast *[0]T to E![]const u8" {
+    var x = @as(anyerror![]const u8, &[0]u8{});
+    try expect((x catch unreachable).len == 0);
+}
+
+var global_array: [4]u8 = undefined;
+test "cast from array reference to fn" {
+    const f = @ptrCast(fn () callconv(.C) void, &global_array);
+    try expect(@ptrToInt(f) == @ptrToInt(&global_array));
+}
+
+test "*const [N]null u8 to ?[]const u8" {
+    const S = struct {
+        fn doTheTest() !void {
+            var a = "Hello";
+            var b: ?[]const u8 = a;
+            try expect(mem.eql(u8, b.?, "Hello"));
+        }
+    };
+    try S.doTheTest();
+    comptime try S.doTheTest();
+}
+
+test "cast between [*c]T and ?[*:0]T on fn parameter" {
+    const S = struct {
+        const Handler = ?fn ([*c]const u8) callconv(.C) void;
+        fn addCallback(handler: Handler) void {
+            _ = handler;
+        }
+
+        fn myCallback(cstr: ?[*:0]const u8) callconv(.C) void {
+            _ = cstr;
+        }
+
+        fn doTheTest() void {
+            addCallback(myCallback);
+        }
+    };
+    S.doTheTest();
+}
+
+var global_struct: struct { f0: usize } = undefined;
+test "assignment to optional pointer result loc" {
+    var foo: struct { ptr: ?*c_void } = .{ .ptr = &global_struct };
+    try expect(foo.ptr.? == @ptrCast(*c_void, &global_struct));
+}
+
+test "cast between *[N]void and []void" {
+    var a: [4]void = undefined;
+    var b: []void = &a;
+    try expect(b.len == 4);
+}