tests.nixpkgs-check-by-name: More consistent errors

pkgs/test/nixpkgs-check-by-name/src/nixpkgs_problem.rs

@@ -202,7 +202,7 @@ impl fmt::Display for NixpkgsProblem {
                     "
                     - Because {} exists, the attribute `pkgs.{package_name}` must be defined like
 
-                        {package_name} = callPackage {} {{ /* ... */ }};
+                        {package_name} = callPackage ./{} {{ /* ... */ }};
 
                       This is however not the case: A different `callPackage` is used.
                       It is defined in {}:{} as
@@ -220,7 +220,7 @@ impl fmt::Display for NixpkgsProblem {
                     "
                     - Because {} exists, the attribute `pkgs.{package_name}` must be defined like
 
-                        {package_name} = callPackage {} {{ /* ... */ }};
+                        {package_name} = callPackage ./{} {{ /* ... */ }};
 
                       This is however not the case: The first callPackage argument is not right:
                       It is defined in {}:{} as
@@ -255,7 +255,7 @@ impl fmt::Display for NixpkgsProblem {
                     "
                     - Because {} exists, the attribute `pkgs.{package_name}` must be defined like
 
-                        {package_name} = callPackage {} {{ /* ... */ }};
+                        {package_name} = callPackage ./{} {{ /* ... */ }};
 
                       This is however not the case.
                       It is defined in {}:{} as

pkgs/test/nixpkgs-check-by-name/tests/alt-callPackage/expected

@@ -1,6 +1,6 @@
 - Because pkgs/by-name/fo/foo exists, the attribute `pkgs.foo` must be defined like
 
-    foo = callPackage pkgs/by-name/fo/foo/package.nix { /* ... */ };
+    foo = callPackage ./pkgs/by-name/fo/foo/package.nix { /* ... */ };
 
   This is however not the case: A different `callPackage` is used.
   It is defined in all-packages.nix:5 as

pkgs/test/nixpkgs-check-by-name/tests/non-syntactical-callPackage-by-name/expected

@@ -1,6 +1,6 @@
 - Because pkgs/by-name/fo/foo exists, the attribute `pkgs.foo` must be defined like
 
-    foo = callPackage pkgs/by-name/fo/foo/package.nix { /* ... */ };
+    foo = callPackage ./pkgs/by-name/fo/foo/package.nix { /* ... */ };
 
   This is however not the case.
   It is defined in all-packages.nix:4 as

pkgs/test/nixpkgs-check-by-name/tests/override-no-call-package/expected

@@ -1,6 +1,6 @@
 - Because pkgs/by-name/no/nonDerivation exists, the attribute `pkgs.nonDerivation` must be defined like
 
-    nonDerivation = callPackage pkgs/by-name/no/nonDerivation/package.nix { /* ... */ };
+    nonDerivation = callPackage ./pkgs/by-name/no/nonDerivation/package.nix { /* ... */ };
 
   This is however not the case.
   It is defined in all-packages.nix:2 as

pkgs/test/nixpkgs-check-by-name/tests/override-no-file/expected

@@ -1,6 +1,6 @@
 - Because pkgs/by-name/no/nonDerivation exists, the attribute `pkgs.nonDerivation` must be defined like
 
-    nonDerivation = callPackage pkgs/by-name/no/nonDerivation/package.nix { /* ... */ };
+    nonDerivation = callPackage ./pkgs/by-name/no/nonDerivation/package.nix { /* ... */ };
 
   This is however not the case: The first callPackage argument is not right:
   It is defined in all-packages.nix:2 as

pkgs/test/nixpkgs-check-by-name/tests/override-non-path/expected

@@ -1,6 +1,6 @@
 - Because pkgs/by-name/fo/foo exists, the attribute `pkgs.foo` must be defined like
 
-    foo = callPackage pkgs/by-name/fo/foo/package.nix { /* ... */ };
+    foo = callPackage ./pkgs/by-name/fo/foo/package.nix { /* ... */ };
 
   This is however not the case: The first callPackage argument is not right:
   It is defined in all-packages.nix:3 as