diff --git a/src/test/regress/expected/alter_table.out b/src/test/regress/expected/alter_table.out
index 2212c8dbb59..12852aa612a 100644
--- a/src/test/regress/expected/alter_table.out
+++ b/src/test/regress/expected/alter_table.out
@@ -3413,6 +3413,13 @@ ALTER TABLE comment_test ALTER COLUMN id SET DATA TYPE int;
 ALTER TABLE comment_test ALTER COLUMN id SET DATA TYPE text;
 ALTER TABLE comment_test ALTER COLUMN positive_col SET DATA TYPE int;
 ALTER TABLE comment_test ALTER COLUMN positive_col SET DATA TYPE bigint;
+-- Some error cases.
+ALTER TABLE comment_test ALTER COLUMN xmin SET DATA TYPE x;
+ERROR:  cannot alter system column "xmin"
+ALTER TABLE comment_test ALTER COLUMN id SET DATA TYPE x;
+ERROR:  type "x" does not exist
+ALTER TABLE comment_test ALTER COLUMN id SET DATA TYPE int COLLATE "C";
+ERROR:  collations are not supported by type integer
 -- Check that the comments are intact.
 SELECT col_description('comment_test'::regclass, 1) as comment;
            comment           
diff --git a/src/test/regress/expected/domain.out b/src/test/regress/expected/domain.out
index 42b6559f9c8..d03ab128e48 100644
--- a/src/test/regress/expected/domain.out
+++ b/src/test/regress/expected/domain.out
@@ -15,6 +15,33 @@ NOTICE:  drop cascades to type dependenttypetest
 -- this should fail because already gone
 drop domain domaindroptest cascade;
 ERROR:  type "domaindroptest" does not exist
+-- some error cases
+create domain d_fail as no_such_type;
+ERROR:  type "no_such_type" does not exist
+create domain d_fail as int constraint cc REFERENCES this_table_not_exists(i);
+ERROR:  foreign key constraints not possible for domains
+create domain d_fail as int4 not null no inherit;
+ERROR:  not-null constraints for domains cannot be marked NO INHERIT
+create domain d_fail as int4 not null null;
+ERROR:  conflicting NULL/NOT NULL constraints
+create domain d_fail as int4 not null default 3 default 3;
+ERROR:  multiple default expressions
+create domain d_fail int4 DEFAULT 3 + 'h';
+ERROR:  invalid input syntax for type integer: "h"
+create domain d_fail int4 collate "C";
+ERROR:  collations are not supported by type integer
+create domain d_fail as anyelement;
+ERROR:  "anyelement" is not a valid base type for a domain
+create domain d_fail as int4 unique;
+ERROR:  unique constraints not possible for domains
+create domain d_fail as int4 PRIMARY key;
+ERROR:  primary key constraints not possible for domains
+create domain d_fail as int4 constraint cc generated by default as identity;
+ERROR:  specifying GENERATED not supported for domains
+create domain d_fail as int4 constraint cc check (values > 1) no inherit;
+ERROR:  check constraints for domains cannot be marked NO INHERIT
+create domain d_fail as int4 constraint cc check (values > 1) deferrable;
+ERROR:  specifying constraint deferrability not supported for domains
 -- Test domain input.
 -- Note: the point of checking both INSERT and COPY FROM is that INSERT
 -- exercises CoerceToDomain while COPY exercises domain_in.
diff --git a/src/test/regress/expected/float8.out b/src/test/regress/expected/float8.out
index de56998f5cd..4965ee55541 100644
--- a/src/test/regress/expected/float8.out
+++ b/src/test/regress/expected/float8.out
@@ -1024,6 +1024,8 @@ create function xfloat8out(xfloat8) returns cstring immutable strict
 NOTICE:  argument type xfloat8 is only a shell
 LINE 1: create function xfloat8out(xfloat8) returns cstring immutabl...
                                    ^
+create type xfloat8 (input = xfloat8in, output = xfloat8out, like = no_such_type);
+ERROR:  type "no_such_type" does not exist
 create type xfloat8 (input = xfloat8in, output = xfloat8out, like = float8);
 create cast (xfloat8 as float8) without function;
 create cast (float8 as xfloat8) without function;
diff --git a/src/test/regress/expected/identity.out b/src/test/regress/expected/identity.out
index 2a2b777c89b..0398a19484f 100644
--- a/src/test/regress/expected/identity.out
+++ b/src/test/regress/expected/identity.out
@@ -43,6 +43,8 @@ CREATE TABLE itest4 (a int, b text);
 ALTER TABLE itest4 ALTER COLUMN a ADD GENERATED ALWAYS AS IDENTITY;  -- error, requires NOT NULL
 ERROR:  column "a" of relation "itest4" must be declared NOT NULL before identity can be added
 ALTER TABLE itest4 ALTER COLUMN a SET NOT NULL;
+ALTER TABLE itest4 ALTER COLUMN c ADD GENERATED ALWAYS AS IDENTITY;  -- error, column c does not exist
+ERROR:  column "c" of relation "itest4" does not exist
 ALTER TABLE itest4 ALTER COLUMN a ADD GENERATED ALWAYS AS IDENTITY;  -- ok
 ALTER TABLE itest4 ALTER COLUMN a DROP NOT NULL;  -- error, disallowed
 ERROR:  column "a" of relation "itest4" is an identity column
diff --git a/src/test/regress/sql/alter_table.sql b/src/test/regress/sql/alter_table.sql
index 637e3dac389..c88f9eaab04 100644
--- a/src/test/regress/sql/alter_table.sql
+++ b/src/test/regress/sql/alter_table.sql
@@ -2145,6 +2145,11 @@ ALTER TABLE comment_test ALTER COLUMN id SET DATA TYPE text;
 ALTER TABLE comment_test ALTER COLUMN positive_col SET DATA TYPE int;
 ALTER TABLE comment_test ALTER COLUMN positive_col SET DATA TYPE bigint;
 
+-- Some error cases.
+ALTER TABLE comment_test ALTER COLUMN xmin SET DATA TYPE x;
+ALTER TABLE comment_test ALTER COLUMN id SET DATA TYPE x;
+ALTER TABLE comment_test ALTER COLUMN id SET DATA TYPE int COLLATE "C";
+
 -- Check that the comments are intact.
 SELECT col_description('comment_test'::regclass, 1) as comment;
 SELECT indexrelid::regclass::text as index, obj_description(indexrelid, 'pg_class') as comment FROM pg_index where indrelid = 'comment_test'::regclass ORDER BY 1, 2;
diff --git a/src/test/regress/sql/domain.sql b/src/test/regress/sql/domain.sql
index ee07b03174e..ad14de355ac 100644
--- a/src/test/regress/sql/domain.sql
+++ b/src/test/regress/sql/domain.sql
@@ -16,6 +16,20 @@ drop domain domaindroptest cascade;
 -- this should fail because already gone
 drop domain domaindroptest cascade;
 
+-- some error cases
+create domain d_fail as no_such_type;
+create domain d_fail as int constraint cc REFERENCES this_table_not_exists(i);
+create domain d_fail as int4 not null no inherit;
+create domain d_fail as int4 not null null;
+create domain d_fail as int4 not null default 3 default 3;
+create domain d_fail int4 DEFAULT 3 + 'h';
+create domain d_fail int4 collate "C";
+create domain d_fail as anyelement;
+create domain d_fail as int4 unique;
+create domain d_fail as int4 PRIMARY key;
+create domain d_fail as int4 constraint cc generated by default as identity;
+create domain d_fail as int4 constraint cc check (values > 1) no inherit;
+create domain d_fail as int4 constraint cc check (values > 1) deferrable;
 
 -- Test domain input.
 
diff --git a/src/test/regress/sql/float8.sql b/src/test/regress/sql/float8.sql
index 98e9926c9e0..81a35e0bf1b 100644
--- a/src/test/regress/sql/float8.sql
+++ b/src/test/regress/sql/float8.sql
@@ -328,6 +328,7 @@ create function xfloat8in(cstring) returns xfloat8 immutable strict
   language internal as 'int8in';
 create function xfloat8out(xfloat8) returns cstring immutable strict
   language internal as 'int8out';
+create type xfloat8 (input = xfloat8in, output = xfloat8out, like = no_such_type);
 create type xfloat8 (input = xfloat8in, output = xfloat8out, like = float8);
 create cast (xfloat8 as float8) without function;
 create cast (float8 as xfloat8) without function;
diff --git a/src/test/regress/sql/identity.sql b/src/test/regress/sql/identity.sql
index cb0e05a2f11..45992a3d894 100644
--- a/src/test/regress/sql/identity.sql
+++ b/src/test/regress/sql/identity.sql
@@ -19,6 +19,7 @@ SELECT pg_get_serial_sequence('itest1', 'a');
 CREATE TABLE itest4 (a int, b text);
 ALTER TABLE itest4 ALTER COLUMN a ADD GENERATED ALWAYS AS IDENTITY;  -- error, requires NOT NULL
 ALTER TABLE itest4 ALTER COLUMN a SET NOT NULL;
+ALTER TABLE itest4 ALTER COLUMN c ADD GENERATED ALWAYS AS IDENTITY;  -- error, column c does not exist
 ALTER TABLE itest4 ALTER COLUMN a ADD GENERATED ALWAYS AS IDENTITY;  -- ok
 ALTER TABLE itest4 ALTER COLUMN a DROP NOT NULL;  -- error, disallowed
 ALTER TABLE itest4 ALTER COLUMN a ADD GENERATED ALWAYS AS IDENTITY;  -- error, already set