gc: use original constant expression in error messages.

Fixes #2768.

R=golang-dev, lvd, iant
CC=golang-dev, remy
https://golang.org/cl/5572081

diff --git a/src/cmd/gc/export.c b/src/cmd/gc/export.c
index 05fdcbf32b8ea90aff7aef93cbe8724e780f07eb..bbed8ae36e18e168ae10712770029e01ebd746e2 100644 (file)
--- a/src/cmd/gc/export.c
+++ b/src/cmd/gc/export.c
@@ -423,6 +423,7 @@ importconst(Sym *s, Type *t, Node *n)
                *n1 = *n;
                n = n1;
        }
+       n->orig = newname(s);
        n->sym = s;
        declare(n, PEXTERN);
 

diff --git a/test/fixedbugs/bug381.go b/test/fixedbugs/bug381.go
index 3f3232bf12f3afd1ba326ad81b373b2930b1412c..293ba71249a5e08a421d3035caf268f207dbb82c 100644 (file)
--- a/test/fixedbugs/bug381.go
+++ b/test/fixedbugs/bug381.go
@@ -7,14 +7,25 @@
 // Issue 2276.
 
 // Check that the error messages says 
-//     bug378.go:19: unsafe.Alignof(0) not used
+//     bug381.go:29: unsafe.Alignof(0) not used
 // and not
-//     bug378.go:19: 4 not used
+//     bug381.go:29: 4 not used
+
+// Issue 2768: previously got
+//    bug381.go:30: cannot use 3 (type time.Weekday) as type int in function argument
+// want
+//    bug381.go:30: cannot use time.Wednesday (type time.Weekday) as type int in function argument
 
 package main
 
-import "unsafe"
+import (
+       "time"
+       "unsafe"
+)
+
+func f(int)
 
 func main() {
        unsafe.Alignof(0) // ERROR "unsafe\.Alignof|value computed is not used"
+       f(time.Wednesday) // ERROR "time.Wednesday|incompatible type"
 }