cases: more test coverage

Closes #11986
Closes #11850
Closes #12159

test/cases/compile_errors/implicit_cast_const_array_to_mutable_slice.zig

@@ -13,6 +13,11 @@ export fn entry2() void {
     const many: [*]u8 = str;
     _ = many;
 }
+export fn entry3() void {
+    const lang: []const u8 = "lang";
+    const targets: [1][]const u8 = [_][]u8{lang};
+    _ = targets;
+}
 
 // error
 // backend=stage2
@@ -24,3 +29,5 @@ export fn entry2() void {
 // :8:27: note: cast discards const qualifier
 // :13:25: error: expected type '[*]u8', found '*const [0:0]u8'
 // :13:25: note: cast discards const qualifier
+// :18:44: error: expected type '[]u8', found '[]const u8'
+// :18:44: note: cast discards const qualifier

test/cases/compile_errors/invalid_store_to_comptime_field.zig

@@ -61,6 +61,11 @@ pub export fn entry6() void {
     };
     _ = State.init(false);
 }
+pub export fn entry7() void {
+    const list1 = .{ "sss", 1, 2, 3 };
+    const list2 = @TypeOf(list1){ .@"0" = "xxx", .@"1" = 4, .@"2" = 5, .@"3" = 6 };
+    _ = list2;
+}
 
 // error
 // target=native
@@ -73,4 +78,5 @@ pub export fn entry6() void {
 // :25:29: note: default value set here
 // :41:16: error: value stored in comptime field does not match the default value of the field
 // :45:12: error: value stored in comptime field does not match the default value of the field
+// :66:43: error: value stored in comptime field does not match the default value of the field
 // :59:35: error: value stored in comptime field does not match the default value of the field

test/cases/compile_errors/invalid_struct_field.zig

@@ -1,4 +1,4 @@
-const A = struct { x : i32, };
+const A = struct { x: i32 };
 export fn f() void {
     var a: A = undefined;
     a.foo = 1;
@@ -10,6 +10,13 @@ export fn g() void {
     const y = a.bar;
     _ = y;
 }
+export fn e() void {
+    const B = struct {
+        fn f() void {}
+    };
+    const b: B = undefined;
+    @import("std").debug.print("{}{}", .{ b.f, b.f });
+}
 
 // error
 // backend=stage2
@@ -18,4 +25,5 @@ export fn g() void {
 // :4:7: error: no field named 'foo' in struct 'tmp.A'
 // :1:11: note: struct declared here
 // :10:17: error: no field named 'bar' in struct 'tmp.A'
-
+// :18:45: error: no field named 'f' in struct 'tmp.e.B'
+// :14:15: note: struct declared here