assign

fn assign(gz: *GenZir, scope: *Scope, infix_node: Ast.Node.Index) InnerError!void {
    try emitDbgNode(gz, infix_node);
    const astgen = gz.astgen;
    const tree = astgen.tree;

    const lhs, const rhs = tree.nodeData(infix_node).node_and_node;
    if (tree.nodeTag(lhs) == .identifier) {
        // This intentionally does not support `@"_"` syntax.
        const ident_name = tree.tokenSlice(tree.nodeMainToken(lhs));
        if (mem.eql(u8, ident_name, "_")) {
            _ = try expr(gz, scope, .{ .rl = .discard, .ctx = .assignment }, rhs);
            return;
        }
    }
    const lvalue = try lvalExpr(gz, scope, lhs);
    _ = try expr(gz, scope, .{ .rl = .{ .ptr = .{
        .inst = lvalue,
        .src_node = infix_node,
    } } }, rhs);
}