organize some compile error tests

Many of these tests check for the incorrect behavior of stage1 whereas
self-hosted correctly does not emit an error, so they are simply
deleted.

The remaining number of test cases within the stage1/ subdirectory is
reduced from 143 to 103.

test/cases/compile_errors/catch_on_undefined_value.zig

@@ -4,7 +4,7 @@ comptime {
 }
 
 // error
-// backend=stage1
+// backend=stage2
 // target=native
 //
-// tmp.zig:3:11: error: use of undefined value here causes undefined behavior
+// :3:11: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/div_assign_on_undefined_value.zig

@@ -0,0 +1,10 @@
+comptime {
+    var a: i64 = undefined;
+    a /= a;
+}
+
+// error
+// backend=stage2
+// target=native
+//
+// :3:10: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/div_on_undefined_value.zig

@@ -0,0 +1,10 @@
+comptime {
+    var a: i64 = undefined;
+    _ = a / a;
+}
+
+// error
+// backend=stage2
+// target=native
+//
+// :3:13: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/enum_field_value_references_enum.zig

@@ -9,7 +9,8 @@ export fn entry() void {
 const D = 1;
 
 // error
-// backend=stage1
+// backend=stage2
 // target=native
 //
-// tmp.zig:1:17: error: enum 'Foo' depends on itself
+// :1:5: error: dependency loop detected
+// :2:9: note: referenced here

test/cases/compile_errors/implicit_cast_from_f64_to_f32.zig

@@ -0,0 +1,18 @@
+var x: f64 = 1.0;
+var y: f32 = x;
+
+export fn entry() void {
+    _ = y;
+}
+export fn entry2() void {
+    var x1: f64 = 1.0;
+    var y2: f32 = x1;
+    _ = y2;
+}
+
+// error
+// backend=llvm
+// target=native
+//
+// :2:14: error: cannot load runtime value in comptime block
+// :9:19: error: expected type 'f32', found 'f64'

test/cases/compile_errors/mod_assign_on_undefined_value.zig

@@ -0,0 +1,10 @@
+comptime {
+    var a: i64 = undefined;
+    a %= a;
+}
+
+// error
+// backend=stage2
+// target=native
+//
+// :3:5: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/mod_on_undefined_value.zig

@@ -0,0 +1,10 @@
+comptime {
+    var a: i64 = undefined;
+    _ = a % a;
+}
+
+// error
+// backend=stage2
+// target=native
+//
+// :3:9: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/mult_assign_on_undefined_value.zig

@@ -0,0 +1,10 @@
+comptime {
+    var a: i64 = undefined;
+    a *= a;
+}
+
+// error
+// backend=stage2
+// target=native
+//
+// :3:10: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/mult_on_undefined_value.zig

@@ -0,0 +1,10 @@
+comptime {
+    var a: i64 = undefined;
+    _ = a * a;
+}
+
+// error
+// backend=stage2
+// target=native
+//
+// :3:13: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/negate_on_undefined_value.zig

@@ -0,0 +1,10 @@
+comptime {
+    var a: i64 = undefined;
+    _ = -a;
+}
+
+// error
+// backend=stage2
+// target=native
+//
+// :3:10: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/orelse_on_undefined_value.zig

@@ -4,7 +4,7 @@ comptime {
 }
 
 // error
-// backend=stage1
+// backend=stage2
 // target=native
 //
-// tmp.zig:3:11: error: use of undefined value here causes undefined behavior
+// :3:11: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/stage1/add_wrap_assign_on_undefined_value.zig

@@ -1,10 +0,0 @@
-comptime {
-    var a: i64 = undefined;
-    a +%= a;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:3:5: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/stage1/add_wrap_on_undefined_value.zig

@@ -1,10 +0,0 @@
-comptime {
-    var a: i64 = undefined;
-    _ = a +% a;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:3:9: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/stage1/alignCast_of_zero_sized_types.zig

@@ -1,27 +0,0 @@
-export fn foo() void {
-    const a: *void = undefined;
-    _ = @alignCast(2, a);
-}
-export fn bar() void {
-    const a: ?*void = undefined;
-    _ = @alignCast(2, a);
-}
-export fn baz() void {
-    const a: []void = undefined;
-    _ = @alignCast(2, a);
-}
-export fn qux() void {
-    const a = struct {
-        fn a(comptime b: u32) void { _ = b; }
-    }.a;
-    _ = @alignCast(2, a);
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:3:23: error: cannot adjust alignment of zero sized type '*void'
-// tmp.zig:7:23: error: cannot adjust alignment of zero sized type '?*void'
-// tmp.zig:11:23: error: cannot adjust alignment of zero sized type '[]void'
-// tmp.zig:17:23: error: cannot adjust alignment of zero sized type 'fn(u32) anytype'

test/cases/compile_errors/stage1/aligned_variable_of_zero-bit_type.zig

@@ -1,10 +0,0 @@
-export fn f() void {
-    var s: struct {} align(4) = undefined;
-    _ = s;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:2:5: error: variable 's' of zero-bit type 'struct:2:12' has no in-memory representation, it cannot be aligned

test/cases/compile_errors/stage1/bin_and_assign_on_undefined_value.zig

@@ -1,10 +0,0 @@
-comptime {
-    var a: i64 = undefined;
-    a &= a;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:3:5: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/stage1/bin_and_on_undefined_value.zig

@@ -1,10 +0,0 @@
-comptime {
-    var a: i64 = undefined;
-    _ = a & a;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:3:9: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/stage1/bin_not_on_undefined_value.zig

@@ -1,10 +0,0 @@
-comptime {
-    var a: i64 = undefined;
-    _ = ~a;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:3:10: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/stage1/bin_or_assign_on_undefined_value.zig

@@ -1,10 +0,0 @@
-comptime {
-    var a: i64 = undefined;
-    a |= a;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:3:5: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/stage1/bin_or_on_undefined_value.zig

@@ -1,10 +0,0 @@
-comptime {
-    var a: i64 = undefined;
-    _ = a | a;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:3:9: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/stage1/bin_xor_assign_on_undefined_value.zig

@@ -1,10 +0,0 @@
-comptime {
-    var a: i64 = undefined;
-    a ^= a;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:3:5: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/stage1/bin_xor_on_undefined_value.zig

@@ -1,10 +0,0 @@
-comptime {
-    var a: i64 = undefined;
-    _ = a ^ a;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:3:9: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/stage1/bool_not_on_undefined_value.zig

@@ -1,10 +0,0 @@
-comptime {
-    var a: bool = undefined;
-    _ = !a;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:3:10: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/stage1/div_assign_on_undefined_value.zig

@@ -1,10 +0,0 @@
-comptime {
-    var a: i64 = undefined;
-    a /= a;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:3:5: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/stage1/div_on_undefined_value.zig

@@ -1,10 +0,0 @@
-comptime {
-    var a: i64 = undefined;
-    _ = a / a;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:3:9: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/stage1/implicit_cast_from_f64_to_f32.zig

@@ -1,10 +0,0 @@
-var x: f64 = 1.0;
-var y: f32 = x;
-
-export fn entry() usize { return @sizeOf(@TypeOf(y)); }
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:2:14: error: expected type 'f32', found 'f64'

test/cases/compile_errors/stage1/int_to_ptr_of_0_bits.zig

@@ -1,11 +0,0 @@
-export fn foo() void {
-    var x: usize = 0x1000;
-    var y: *void = @intToPtr(*void, x);
-    _ = y;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:3:30: error: type '*void' has 0 bits and cannot store information

test/cases/compile_errors/stage1/mod_assign_on_undefined_value.zig

@@ -1,10 +0,0 @@
-comptime {
-    var a: i64 = undefined;
-    a %= a;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:3:5: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/stage1/mod_on_undefined_value.zig

@@ -1,10 +0,0 @@
-comptime {
-    var a: i64 = undefined;
-    _ = a % a;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:3:9: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/stage1/mult_assign_on_undefined_value.zig

@@ -1,10 +0,0 @@
-comptime {
-    var a: i64 = undefined;
-    a *= a;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:3:5: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/stage1/mult_on_undefined_value.zig

@@ -1,10 +0,0 @@
-comptime {
-    var a: i64 = undefined;
-    _ = a * a;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:3:9: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/stage1/mult_wrap_assign_on_undefined_value.zig

@@ -1,10 +0,0 @@
-comptime {
-    var a: i64 = undefined;
-    a *%= a;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:3:5: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/stage1/mult_wrap_on_undefined_value.zig

@@ -1,10 +0,0 @@
-comptime {
-    var a: i64 = undefined;
-    _ = a *% a;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:3:9: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/stage1/negate_on_undefined_value.zig

@@ -1,10 +0,0 @@
-comptime {
-    var a: i64 = undefined;
-    _ = -a;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:3:10: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/stage1/negate_wrap_on_undefined_value.zig

@@ -1,10 +0,0 @@
-comptime {
-    var a: i64 = undefined;
-    _ = -%a;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:3:11: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/stage1/non_compile_time_array_concatenation.zig

@@ -1,11 +0,0 @@
-fn f() []u8 {
-    return s ++ "foo";
-}
-var s: [10]u8 = undefined;
-export fn entry() usize { return @sizeOf(@TypeOf(f)); }
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:2:12: error: unable to evaluate constant expression

test/cases/compile_errors/stage1/optional_pointer_to_void_in_extern_struct.zig

@@ -1,14 +0,0 @@
-const Foo = extern struct {
-    x: ?*const void,
-};
-const Bar = extern struct {
-    foo: Foo,
-    y: i32,
-};
-export fn entry(bar: *Bar) void {_ = bar;}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:2:5: error: extern structs cannot contain fields of type '?*const void'

test/cases/compile_errors/stage1/ptrCast_a_0_bit_type_to_a_non-_0_bit_type.zig

@@ -1,13 +0,0 @@
-export fn entry() bool {
-    var x: u0 = 0;
-    const p = @ptrCast(?*u0, &x);
-    return p == null;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:3:15: error: '*u0' and '?*u0' do not have the same in-memory representation
-// tmp.zig:3:31: note: '*u0' has no in-memory bits
-// tmp.zig:3:24: note: '?*u0' has in-memory bits

test/cases/compile_errors/stage1/recursive_inferred_error_set.zig

@@ -1,12 +0,0 @@
-export fn entry() void {
-    foo() catch unreachable;
-}
-fn foo() !void {
-    try foo();
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:5:5: error: cannot resolve inferred error set '@typeInfo(@typeInfo(@TypeOf(foo)).Fn.return_type.?).ErrorUnion.error_set': function 'foo' not fully analyzed yet

test/cases/compile_errors/stage1/shift_left_assign_on_undefined_value.zig

@@ -1,10 +0,0 @@
-comptime {
-    var a: i64 = undefined;
-    a >>= 2;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:3:5: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/stage1/shift_left_on_undefined_value.zig

@@ -1,10 +0,0 @@
-comptime {
-    var a: i64 = undefined;
-    _ = a << 2;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:3:9: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/stage1/shift_right_assign_on_undefined_value.zig

@@ -1,10 +0,0 @@
-comptime {
-    var a: i64 = undefined;
-    a >>= 2;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:3:5: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/stage1/shift_right_on_undefined_value.zig

@@ -1,10 +0,0 @@
-comptime {
-    var a: i64 = undefined;
-    _ = a >> 2;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:3:9: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/stage1/sub_assign_on_undefined_value.zig

@@ -1,10 +0,0 @@
-comptime {
-    var a: i64 = undefined;
-    a -= a;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:3:5: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/stage1/sub_on_undefined_value.zig

@@ -1,10 +0,0 @@
-comptime {
-    var a: i64 = undefined;
-    _ = a - a;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:3:9: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/stage1/sub_wrap_assign_on_undefined_value.zig

@@ -1,10 +0,0 @@
-comptime {
-    var a: i64 = undefined;
-    a -%= a;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:3:5: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/stage1/sub_wrap_on_undefined_value.zig

@@ -1,10 +0,0 @@
-comptime {
-    var a: i64 = undefined;
-    _ = a -% a;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:3:9: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/stage1/truncate_undefined_value.zig

@@ -1,10 +0,0 @@
-export fn entry() void {
-    var z = @truncate(u8, @as(u16, undefined));
-    _ = z;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:2:27: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/sub_assign_on_undefined_value.zig

@@ -0,0 +1,10 @@
+comptime {
+    var a: i64 = undefined;
+    a -= a;
+}
+
+// error
+// backend=stage2
+// target=native
+//
+// :3:10: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/sub_on_undefined_value.zig

@@ -0,0 +1,10 @@
+comptime {
+    var a: i64 = undefined;
+    _ = a - a;
+}
+
+// error
+// backend=stage2
+// target=native
+//
+// :3:13: error: use of undefined value here causes undefined behavior