remove nearly all remaining deprecations (#28486)

* Fix at-inferred with a single dot-broadcast op

* Mark .op type-inference-based completion of method signatures as broken

REPLCompletions allows tab-completion to show the possible signatures of a given function when in the midst of writing its arguments. It uses inference to determine the possible types of the already-written arguments, subsetting the possible signatures. With the removal of `.op` as a function, it is no longer able to infer these types and thus no longer subsets the signatures as previously expected. The failure mode is very graceful here -- it just assumes `Any` and shows more signatures. This can be re-implemented later

base/broadcast.jl

@@ -1079,9 +1079,10 @@ function __dot__(x::Expr)
         Expr(x.head, x.args[1], dotargs[2])
     else
         if x.head == :&& || x.head == :||
-            Base.depwarn("""
-                using $(x.head) expressions in @. is deprecated; in the future it will
-                become elementwise. Break the expression into smaller parts instead.""", nothing)
+            error("""
+                Using `&&` and `||` is disallowed in `@.` expressions.
+                Use `&` or `|` for elementwise logical operations.
+                """)
         end
         head = string(x.head)
         if last(head) == '=' && first(head) != '.'

base/client.jl

@@ -90,12 +90,6 @@ function ip_matches_func(ip, func::Symbol)
 end
 
 function display_error(io::IO, er, bt)
-    if !isempty(bt)
-        st = stacktrace(bt)
-        if !isempty(st)
-            io = redirect(io, log_error_to, st[1])
-        end
-    end
     printstyled(io, "ERROR: "; bold=true, color=Base.error_color())
     # remove REPL-related frames from interactive printing
     eval_ind = findlast(addr->ip_matches_func(addr, :eval), bt)