Compiler reports incorrect type error on the wrong line #10663
Description
Steps to reproduce:
Attempt to compile the following code, which tries to return an OPCMessage containing one too many levels of indirection for data:
const std = @import("std");
const ArrayList = std.ArrayList;
pub const io_mode = .evented;
const OPCMessage = struct {
data: []const u8,
};
pub const Client = struct {
stream: std.net.Stream,
handle_frame: @Frame(handle),
allocator: std.mem.Allocator,
fn read_message(self: *Client) !OPCMessage {
const data_len = 10;
const data_buf = try self.allocator.alloc(u8, data_len); // The compiler reports the error here
// Adding more code here does not affect the output
return OPCMessage{
.data = &data_buf, // The error is the & shouldn't be here
};
}
fn handle(self: *Client) !void {
defer {
self.stream.close();
}
while (true) {
_ = self.read_message() catch |err| {
std.log.info("Client Lost: {any}\n", .{err});
return;
};
}
}
};
pub fn main() anyerror!void {
var gpa = std.heap.GeneralPurposeAllocator(.{}){};
var heap = gpa.allocator();
var server = std.net.StreamServer.init(.{ .reuse_address = true });
defer server.deinit();
var clients = std.AutoHashMap(*Client, void).init(heap);
try server.listen(std.net.Address.parseIp("127.0.0.1", 42024) catch unreachable);
std.log.info("Listening on {}\n", .{server.listen_address});
while(true) {
const client = try heap.create(Client);
client.* = Client {
.stream = (try server.accept()).stream,
.handle_frame = async client.handle(),
.allocator = heap
};
try clients.putNoClobber(client, {});
}
}
Compiler output:
zig build run
./src/main.zig:16:9: error: expected type '[]const u8', found '*const []u8'
const data_buf = try self.allocator.alloc(u8, data_len); // The compiler reports the error here
^
./src/main.zig:12:5: note: while checking this field
handle_frame: @Frame(handle),
^
Expected compiler output:
Something indicating that the error is in the return statement rather than the allocation.
System info:
$ zig version
0.10.0-dev.347+f763000dc
$ uname -a
Linux BOUZOUKI 5.10.60.1-microsoft-standard-WSL2 #1 SMP Wed Aug 25 23:20:18 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux