commit 91dd7954c44b201aa3b16e66b18d7a5df00fded9
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Mon Apr 12 11:45:21 2021

    libstdc++: Fix some tests that fail in C++20 mode
    
    The linear_congruential_engine negative tests fail with a different
    error in C++20 mode, because double is no longer an invalid type for
    NTTP. Adjust the expected errors.
    
    libstdc++-v3/ChangeLog:
    
            * testsuite/26_numerics/random/linear_congruential_engine/requirements/non_uint_neg.cc:
            Adjust expected error for C++20 mode.
            * testsuite/tr1/5_numerical_facilities/random/linear_congruential/requirements/non_uint_neg.cc:
            Likewise.

diff --git a/libstdc++-v3/testsuite/26_numerics/random/linear_congruential_engine/requirements/non_uint_neg.cc b/libstdc++-v3/testsuite/26_numerics/random/linear_congruential_engine/requirements/non_uint_neg.cc
index e04e8ca6972..a36d63c6c7b 100644
--- a/libstdc++-v3/testsuite/26_numerics/random/linear_congruential_engine/requirements/non_uint_neg.cc
+++ b/libstdc++-v3/testsuite/26_numerics/random/linear_congruential_engine/requirements/non_uint_neg.cc
@@ -20,10 +20,12 @@
 
 // { dg-do compile { target c++11 } }
 // { dg-require-cstdint "" }
+// { dg-error "not a valid type" "" { target { ! c++20 } } 31 }
+// { dg-error "from 'int' to 'double'" "" { target c++20 } 31 }
 
 // 26.4.3.1 class template linear_congruential_engine [rand.eng.lcong]
 // 26.4.2.2 Concept RandomNumberEngine [rand.concept.eng]
 
 #include <random>
 
-std::linear_congruential_engine<double, 48271, 0, 2147483647> x; // { dg-error "not a valid type" }
+std::linear_congruential_engine<double, 48271, 0, 2147483647> x;
diff --git a/libstdc++-v3/testsuite/tr1/5_numerical_facilities/random/linear_congruential/requirements/non_uint_neg.cc b/libstdc++-v3/testsuite/tr1/5_numerical_facilities/random/linear_congruential/requirements/non_uint_neg.cc
index 5ad82db1def..53b15f32516 100644
--- a/libstdc++-v3/testsuite/tr1/5_numerical_facilities/random/linear_congruential/requirements/non_uint_neg.cc
+++ b/libstdc++-v3/testsuite/tr1/5_numerical_facilities/random/linear_congruential/requirements/non_uint_neg.cc
@@ -19,7 +19,8 @@
 
 // { dg-do compile }
 // { dg-options "-D_GLIBCXX_CONCEPT_CHECKS" }
-// { dg-error "not a valid type" "" { target *-*-* } 29 }
+// { dg-error "not a valid type" "" { target { ! c++20 } } 30 }
+// { dg-error "from 'int' to 'double'" "" { target c++20 } 30 }
 
 // 5.1.4.1 class template linear_congruential [tr.rand.eng.lcong]
 // 5.1.4.1 [4]