tests: add tests for dynamic attribute in let and inherit

Regression tests for the previous commit.

Co-authored-by: Sergei Zimmerman <sergei@zimmerman.foo>
Co-authored-by: piegames <git@piegames.de>

maintainers/flake-module.nix

@@ -79,6 +79,8 @@
               # Not supported by nixfmt
               ''^tests/functional/lang/eval-okay-deprecate-cursed-or\.nix$''
               ''^tests/functional/lang/eval-okay-attrs5\.nix$''
+              ''^tests/functional/lang/eval-fail-dynamic-attrs-inherit\.nix$''
+              ''^tests/functional/lang/eval-fail-dynamic-attrs-inherit-2\.nix$''
 
               # More syntax tests
               # These tests, or parts of them, should have been parse-* test cases.

tests/functional/lang/eval-fail-dynamic-attrs-inherit-2.err.exp

@@ -0,0 +1,6 @@
+error: dynamic attributes not allowed in inherit
+       at /pwd/lang/eval-fail-dynamic-attrs-inherit-2.nix:5:15:
+            4| {
+            5|   inherit (a) ${"b" + ""};
+             |               ^
+            6| }

tests/functional/lang/eval-fail-dynamic-attrs-inherit-2.nix

@@ -0,0 +1,6 @@
+let
+  a.b = 1;
+in
+{
+  inherit (a) ${"b" + ""};
+}

tests/functional/lang/eval-fail-dynamic-attrs-inherit.err.exp

@@ -0,0 +1,6 @@
+error: dynamic attributes not allowed in inherit
+       at /pwd/lang/eval-fail-dynamic-attrs-inherit.nix:5:11:
+            4| {
+            5|   inherit ${"a" + ""};
+             |           ^
+            6| }

tests/functional/lang/eval-fail-dynamic-attrs-inherit.nix

@@ -0,0 +1,6 @@
+let
+  a = 1;
+in
+{
+  inherit ${"a" + ""};
+}

tests/functional/lang/eval-fail-dynamic-attrs-let-2.err.exp

@@ -0,0 +1,5 @@
+error: dynamic attributes not allowed in let
+       at /pwd/lang/eval-fail-dynamic-attrs-let-2.nix:1:1:
+            1| let
+             | ^
+            2|   ${"${"a"}"} = 1;

tests/functional/lang/eval-fail-dynamic-attrs-let-2.nix

@@ -0,0 +1,4 @@
+let
+  ${"${"a"}"} = 1;
+in
+a

tests/functional/lang/eval-fail-dynamic-attrs-let-3.err.exp

@@ -0,0 +1,5 @@
+error: dynamic attributes not allowed in let
+       at /pwd/lang/eval-fail-dynamic-attrs-let-3.nix:1:1:
+            1| let
+             | ^
+            2|   "${"a"}" = 1;

tests/functional/lang/eval-fail-dynamic-attrs-let-3.nix

@@ -0,0 +1,4 @@
+let
+  "${"a"}" = 1;
+in
+a

tests/functional/lang/eval-fail-dynamic-attrs-let.err.exp

@@ -0,0 +1,5 @@
+error: dynamic attributes not allowed in let
+       at /pwd/lang/eval-fail-dynamic-attrs-let.nix:1:1:
+            1| let
+             | ^
+            2|   ${"a" + ""} = 1;

tests/functional/lang/eval-fail-dynamic-attrs-let.nix

@@ -0,0 +1,4 @@
+let
+  ${"a" + ""} = 1;
+in
+a

tests/functional/lang/eval-okay-dynamic-attrs-3.exp

@@ -0,0 +1 @@
+{ a = 1; attrs = { b = 1; c = 1; d = 1; }; b = 1; c = 1; d = 1; }

tests/functional/lang/eval-okay-dynamic-attrs-3.nix

@@ -0,0 +1,14 @@
+# dynamic attrs are not generally allowed in `let`, and inherit, but they are if they only contain a string
+let
+  ${"a"} = 1;
+  attrs = rec {
+    b = c;
+    ${"c"} = d;
+    d = a;
+  };
+in
+{
+  inherit ${"a"};
+  inherit attrs;
+  inherit (attrs) ${"b"} ${"c"} d;
+}