Remove references to D1 opDot (#20772)

compiler/src/dmd/frontend.h

@@ -8828,7 +8828,6 @@ struct Id final
     static Identifier* opSliceAssign;
     static Identifier* opCall;
     static Identifier* opCast;
-    static Identifier* opDot;
     static Identifier* opDispatch;
     static Identifier* opDollar;
     static Identifier* opUnary;

compiler/src/dmd/id.d

@@ -232,7 +232,6 @@ immutable Msgtable[] msgtable =
     { "opSliceAssign" },
     { "opCall" },
     { "opCast" },
-    { "opDot" },
     { "opDispatch" },
     { "opDollar" },
     { "opUnary" },

compiler/src/dmd/typesem.d

@@ -4883,7 +4883,7 @@ Expression dotExp(Type mt, Scope* sc, Expression e, Identifier ident, DotExpFlag
 
     /***************************************
      * `ident` was not found as a member of `mt`.
-     * Attempt to use overloaded opDot(), overloaded opDispatch(), or `alias this`.
+     * Attempt to use overloaded opDispatch() or `alias this`.
      * If that fails, forward to visitType().
      * Params:
      *  mt = class or struct
@@ -4939,21 +4939,6 @@ Expression dotExp(Type mt, Scope* sc, Expression e, Identifier ident, DotExpFlag
             ident != Id.postblit &&
             ident != Id.__xpostblit)
         {
-            /* Look for overloaded opDot() to see if we should forward request
-             * to it.
-             */
-            if (auto fd = search_function(sym, Id.opDot))
-            {
-                /* Rewrite e.ident as:
-                 *  e.opDot().ident
-                 */
-                e = build_overload(e.loc, sc, e, null, fd);
-                // @@@DEPRECATED_2.110@@@.
-                // Deprecated in 2.082, made an error in 2.100.
-                error(e.loc, "`opDot` is obsolete. Use `alias this`");
-                return ErrorExp.get();
-            }
-
             /* Look for overloaded opDispatch to see if we should forward request
              * to it.
              */

compiler/test/fail_compilation/deprecateopdot.d

@@ -1,30 +0,0 @@
-/*
-REQUIRED_ARGS: -de
-TEST_OUTPUT:
----
-fail_compilation/deprecateopdot.d(27): Error: `opDot` is obsolete. Use `alias this`
-fail_compilation/deprecateopdot.d(28): Error: `opDot` is obsolete. Use `alias this`
-fail_compilation/deprecateopdot.d(29): Error: `opDot` is obsolete. Use `alias this`
----
-*/
-struct S6
-{
-    int a, b;
-}
-struct T6
-{
-    S6 s;
-
-    S6* opDot() return
-    {
-        return &s;
-    }
-}
-
-void test6()
-{
-    T6 t;
-    t.a = 4;
-    assert(t.a == 4);
-    t.b = 5;
-}