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tagged union with only one field trips assertion #1495

andrewrk opened this Issue Sep 10, 2018 · 0 comments


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andrewrk commented Sep 10, 2018

example provided by @cgag

const std  = @import("std");
const warn = std.debug.warn;
const fmt  = std.fmt;
const mem  = std.mem;

var alloc = &std.heap.DirectAllocator.init().allocator;

pub const Expr = union(enum) {
    Literal: Literal,

pub const Literal = union(enum) {
    Number: f64,
    Bool: bool,

pub fn main() !void {
    const s = try fmt.allocPrint(alloc, "{}", Expr{.Literal=Literal{.Bool=true}});
zig: /home/andy/downloads/zig/src/codegen.cpp:4721: LLVMOpaqueValue* ir_render_union_tag(CodeGen*, IrExecutable*, IrInstructionUnionTag*): Assertion `union_type->data.unionation.gen_tag_index != SIZE_MAX' failed.

@andrewrk andrewrk added the bug label Sep 10, 2018

@andrewrk andrewrk added this to the 0.3.0 milestone Sep 10, 2018

@andrewrk andrewrk closed this in 22e39e1 Sep 13, 2018

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