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stage1: Make sure union(enum(T)) is valid

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The T type should be wide enough to fit values in the  0...num field
range.

Closes #6988
This commit is contained in:
LemonBoy
2020-11-05 20:40:20 +01:00
committed by Andrew Kelley
parent f85d719952
commit 78840c4ab2
2 changed files with 47 additions and 0 deletions
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31
test/compile_errors.zig
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@@ -2,6 +2,37 @@ const tests = @import("tests.zig");
const std = @import("std");
pub fn addCases(cases: *tests.CompileErrorContext) void {
cases.add("union with too small explicit signed tag type",
\\const U = union(enum(i2)) {
\\ A: u8,
\\ B: u8,
\\ C: u8,
\\ D: u8,
\\};
\\export fn entry() void {
\\ _ = U{ .D = 1 };
\\}
, &[_][]const u8{
"tmp.zig:1:22: error: specified integer tag type cannot represent every field",
"tmp.zig:1:22: note: type i2 cannot fit values in range 0...3",
});
cases.add("union with too small explicit unsigned tag type",
\\const U = union(enum(u2)) {
\\ A: u8,
\\ B: u8,
\\ C: u8,
\\ D: u8,
\\ E: u8,
\\};
\\export fn entry() void {
\\ _ = U{ .E = 1 };
\\}
, &[_][]const u8{
"tmp.zig:1:22: error: specified integer tag type cannot represent every field",
"tmp.zig:1:22: note: type u2 cannot fit values in range 0...4",
});
cases.add("unreachable executed at comptime",
\\fn foo(comptime x: i32) i32 {
\\ comptime {