From e1b76fde8ffaa74dffc895c2e2e625e30428b435 Mon Sep 17 00:00:00 2001
From: Ian Lance Taylor <ian@gcc.gnu.org>
Date: Thu, 26 Oct 2017 23:04:12 +0000
Subject: compiler: explicitly convert between type aliases

    Otherwise we can get a crash in the backend.

    Test case is https://golang.org/cl/73790.

    Reviewed-on: https://go-review.googlesource.com/73810

From-SVN: r254126
---
 gcc/go/gofrontend/MERGE          |  2 +-
 gcc/go/gofrontend/expressions.cc | 16 +++++++++++-----
 2 files changed, 12 insertions(+), 6 deletions(-)

(limited to 'gcc/go')

diff --git a/gcc/go/gofrontend/MERGE b/gcc/go/gofrontend/MERGE
index 8b1846d..0fa2ccc 100644
--- a/gcc/go/gofrontend/MERGE
+++ b/gcc/go/gofrontend/MERGE
@@ -1,4 +1,4 @@
-a409ac2c78899e638a014c97891925bec93cb3ad
+64d570c590a76921cbdca4efb22e4675e19cc809
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.
diff --git a/gcc/go/gofrontend/expressions.cc b/gcc/go/gofrontend/expressions.cc
index 8337cbe..dad22eb 100644
--- a/gcc/go/gofrontend/expressions.cc
+++ b/gcc/go/gofrontend/expressions.cc
@@ -144,8 +144,8 @@ Expression::convert_for_assignment(Gogo*, Type* lhs_type,
       || rhs->is_error_expression())
     return Expression::make_error(location);
 
-  if (lhs_type->forwarded() != rhs_type->forwarded()
-      && lhs_type->interface_type() != NULL)
+  bool are_identical = Type::are_identical(lhs_type, rhs_type, false, NULL);
+  if (!are_identical && lhs_type->interface_type() != NULL)
     {
       if (rhs_type->interface_type() == NULL)
         return Expression::convert_type_to_interface(lhs_type, rhs, location);
@@ -153,8 +153,7 @@ Expression::convert_for_assignment(Gogo*, Type* lhs_type,
         return Expression::convert_interface_to_interface(lhs_type, rhs, false,
                                                           location);
     }
-  else if (lhs_type->forwarded() != rhs_type->forwarded()
-	   && rhs_type->interface_type() != NULL)
+  else if (!are_identical && rhs_type->interface_type() != NULL)
     return Expression::convert_interface_to_type(lhs_type, rhs, location);
   else if (lhs_type->is_slice_type() && rhs_type->is_nil_type())
     {
@@ -165,8 +164,15 @@ Expression::convert_for_assignment(Gogo*, Type* lhs_type,
     }
   else if (rhs_type->is_nil_type())
     return Expression::make_nil(location);
-  else if (Type::are_identical(lhs_type, rhs_type, false, NULL))
+  else if (are_identical)
     {
+      if (lhs_type->forwarded() != rhs_type->forwarded())
+	{
+	  // Different but identical types require an explicit
+	  // conversion.  This happens with type aliases.
+	  return Expression::make_cast(lhs_type, rhs, location);
+	}
+
       // No conversion is needed.
       return rhs;
     }
-- 
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