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std.fmt.format: add helpful compile error for non-tuple args

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Andrew Kelley 2019-12-31 13:13:13 -05:00
parent d972d1c942
commit 25051832b3
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1 changed files with 3 additions and 0 deletions
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lib/std/fmt.zig
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@ -94,6 +94,9 @@ pub fn format(
args: var,
) Errors!void {
const ArgSetType = @IntType(false, 32);
if (@typeInfo(@TypeOf(args)) != .Struct) {
@compileError("Expected tuple or struct argument, found " ++ @typeName(@TypeOf(args)));
}
if (args.len > ArgSetType.bit_count) {
@compileError("32 arguments max are supported per format call");
}