nix/tests/functional/lang/eval-fail-bad-string-interpolation-4.err.exp

error:
       … while evaluating a path segment
         at /pwd/lang/eval-fail-bad-string-interpolation-4.nix:9:3:
            8| # The error message should not be too long.
            9| ''${pkgs}''
             |   ^
           10|

       error: cannot coerce a set to a string: { a = { a = { a = { a = "ha"; b = "ha"; c = "ha"; d = "ha"; e = "ha"; f = "ha"; g = "ha"; h = "ha"; j = "ha"; }; «8 attributes elided» }; «8 attributes elided» }; «8 attributes elided» }
tests/lang/eval-fail-bad-string-interpolation-4: init 2023-12-09 01:17:36 +00:00			`error:`
			`… while evaluating a path segment`
			`at /pwd/lang/eval-fail-bad-string-interpolation-4.nix:9:3:`
			`8\| # The error message should not be too long.`
			`9\| ''${pkgs}''`
			`\| ^`
			`10\|`

Fix underflow in Printer::printAttrs The code that counts the number of elided attrs incorrectly used the per-printer "global" attribute counter instead of a counter that was relevant only to the current attribute set. This bug flew under the radar because often the attribute sets aren't nested, not big enough, or we wouldn't pay attention to the numbers. I've noticed the issue because the difference underflowed. Although this behavior is tested by the functional test lang/eval-fail-bad-string-interpolation-4.nix, the underflow slipped through review. A simpler reproducer would be as follows, but I haven't added it to the test suite to keep it simple and marginally faster. ``` $ nix run nix/2.23.1 -- eval --expr '"" + (let v = { a = { a = 1; b = 2; c = 1; d = 1; e = 1; f = 1; g = 1; h = 1; }; b = { a = 1; b = 1; c = 1; }; }; in builtins.deepSeq v v)' error: … while evaluating a path segment at «string»:1:6: 1\| "" + (let v = { a = { a = 1; b = 2; c = 1; d = 1; e = 1; f = 1; g = 1; h = 1; }; b = { a = 1; b = 1; c = 1; }; }; in builtins.deepSeq v v) \| ^ error: cannot coerce a set to a string: { a = { a = 1; b = 2; c = 1; d = 1; e = 1; f = 1; g = 1; h = 1; }; b = { a = 1; «4294967289 attributes elided» }; } ``` 2024-06-29 11:48:17 +00:00			`error: cannot coerce a set to a string: { a = { a = { a = { a = "ha"; b = "ha"; c = "ha"; d = "ha"; e = "ha"; f = "ha"; g = "ha"; h = "ha"; j = "ha"; }; «8 attributes elided» }; «8 attributes elided» }; «8 attributes elided» }`