Payload capture has incorrect debug info

[g-w1]

Not relevant, look at the comments by Vexu below.

[Vexu]

You're putting a pointer to a stack variable into the hashmap:

+    } else {
+        var new_list = try ArrayListUnmanaged(usize).initCapacity(self.gpa, 1);
+        new_list.appendAssumeCapacity(src);
+        try self.compile_log_decls.put(self.gpa, decl, &new_list);
+    }

self.compile_log_decls should have type std.AutoArrayHashMapUnmanaged(*Decl, ArrayListUnmanaged(usize))
self.failed_decls should have type std.AutoArrayHashMapUnmanaged(*Decl, ArrayListUnmanaged(usize)), errors are relatively rare so using little extra memory is acceptable.

[Vexu]

Here's a reduction for gdb showing the wrong type:

pub fn main() void {
    var a: ?u16 = 0;
    var b: ?u8 = 1;

    if (a) |*some| {
        @breakpoint(); 
        some.* += 1;
    }

    if (b) |*some| {
        @breakpoint();
        some.* += 1;
    }
}

Program received signal SIGTRAP, Trace/breakpoint trap.
main () at /home/vexu/Documents/zig/zig/build/a.zig:76
76              some.* += 1;
(gdb) ptype some
type = u16 *
(gdb) c
Continuing.

Program received signal SIGTRAP, Trace/breakpoint trap.
main () at /home/vexu/Documents/zig/zig/build/a.zig:81
81              some.* += 1;
(gdb) ptype some
type = u16 *