Fix Issue 7050 - Safety error message should include full function names

src/expression.c

@@ -1705,13 +1705,13 @@ void Expression::checkPurity(Scope *sc, FuncDeclaration *f)
         {
             if (outerfunc->setImpure())
                 error("pure function '%s' cannot call impure function '%s'",
-                    outerfunc->toChars(), f->toChars());
+                    outerfunc->toPrettyChars(), f->toPrettyChars());
         }
     }
 #else
     if (sc->func && sc->func->isPure() && !sc->intypeof && !f->isPure())
         error("pure function '%s' cannot call impure function '%s'",
-            sc->func->toChars(), f->toChars());
+            sc->func->toPrettyChars(), f->toPrettyChars());
 #endif
 }
 
@@ -1805,8 +1805,13 @@ void Expression::checkSafety(Scope *sc, FuncDeclaration *f)
         !f->isSafe() && !f->isTrusted())
     {
         if (sc->func->setUnsafe())
+        {
+            if (loc.linnum == 0)  // e.g. implicitly generated dtor
+                loc = sc->func->loc;
+
             error("safe function '%s' cannot call system function '%s'",
-                sc->func->toChars(), f->toChars());
+                sc->func->toPrettyChars(), f->toPrettyChars());
+        }
     }
 }
 #endif
@@ -8321,12 +8326,12 @@ Expression *CallExp::semantic(Scope *sc)
         if (sc->func && !tf->purity && !(sc->flags & SCOPEdebug))
         {
             if (sc->func->setImpure())
-                error("pure function '%s' cannot call impure %s '%s'", sc->func->toChars(), p, e1->toChars());
+                error("pure function '%s' cannot call impure %s '%s'", sc->func->toPrettyChars(), p, e1->toChars());
         }
         if (sc->func && tf->trust <= TRUSTsystem)
         {
             if (sc->func->setUnsafe())
-                error("safe function '%s' cannot call system %s '%s'", sc->func->toChars(), p, e1->toChars());
+                error("safe function '%s' cannot call system %s '%s'", sc->func->toPrettyChars(), p, e1->toChars());
         }
 
         if (!tf->callMatch(NULL, arguments))

test/fail_compilation/diag7050a.d

@@ -0,0 +1,14 @@
+/*
+TEST_OUTPUT:
+---
+fail_compilation/diag7050a.d(5): Error: safe function 'diag7050a.foo' cannot call system function 'diag7050a.Foo.this'
+---
+*/
+
+#line 1
+struct Foo {
+  this (int a) {}
+}
+@safe void foo() {
+  auto f = Foo(3);
+}

test/fail_compilation/diag7050b.d

@@ -0,0 +1,15 @@
+/*
+TEST_OUTPUT:
+---
+fail_compilation/diag7050b.d(5): Error: pure function 'diag7050b.f.g' cannot call impure function 'diag7050b.f'
+---
+*/
+
+#line 1
+void f()
+{
+    pure void g()
+    {
+        f();
+    }
+}

test/fail_compilation/diag7050c.d

@@ -0,0 +1,22 @@
+/*
+TEST_OUTPUT:
+---
+fail_compilation/diag7050c.d(7): Error: safe function 'diag7050c.B.~this' cannot call system function 'diag7050c.A.~this'
+---
+*/
+
+#line 1
+struct A
+{
+    ~this(){}
+}
+
+@safe struct B
+{
+    A a;
+}
+
+@safe void f()
+{
+    auto x = B.init;
+}