From 1176e574c72e71078b63fa03caa22e90ec3d0644 Mon Sep 17 00:00:00 2001 From: Qyriad Date: Mon, 24 Jun 2024 17:26:21 -0600 Subject: [PATCH] distinguish between throws & errors during throw MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Turns errors like this: let throwMsg = a: throw (a + " invalid bar"); in throwMsg "bullshit" error: … from call site at «string»:3:4: 2| throwMsg = a: throw (a + " invalid bar"); 3| in throwMsg "bullshit" | ^ … while calling 'throwMsg' at «string»:2:14: 1| let 2| throwMsg = a: throw (a + " invalid bar"); | ^ 3| in throwMsg "bullshit" … while calling the 'throw' builtin at «string»:2:17: 1| let 2| throwMsg = a: throw (a + " invalid bar"); | ^ 3| in throwMsg "bullshit" error: bullshit invalid bar into errors like this: let throwMsg = a: throw (a + " invalid bar"); in throwMsg "bullshit" error: … from call site at «string»:3:4: 2| throwMsg = a: throw (a + " invalid bar"); 3| in throwMsg "bullshit" | ^ … while calling 'throwMsg' at «string»:2:14: 1| let 2| throwMsg = a: throw (a + " invalid bar"); | ^ 3| in throwMsg "bullshit" … caused by explicit throw at «string»:2:17: 1| let 2| throwMsg = a: throw (a + " invalid bar"); | ^ 3| in throwMsg "bullshit" error: bullshit invalid bar Change-Id: I593688928ece20f97999d1bf03b2b46d9ac338cb --- src/libexpr/eval.cc | 9 +++++++++ tests/functional/eval.sh | 2 +- tests/functional/lang/eval-fail-duplicate-traces.err.exp | 2 +- .../eval-fail-foldlStrict-strict-op-application.err.exp | 2 +- tests/functional/lang/eval-fail-mutual-recursion.err.exp | 2 +- tests/functional/lang/eval-fail-not-throws.err.exp | 2 +- tests/functional/lang/eval-fail-toJSON.err.exp | 2 +- 7 files changed, 15 insertions(+), 6 deletions(-) diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc index 56581cc19..d9bdb0d2c 100644 --- a/src/libexpr/eval.cc +++ b/src/libexpr/eval.cc @@ -1807,6 +1807,15 @@ void EvalState::callFunction(Value & fun, size_t nrArgs, Value * * args, Value & try { fn->fun(*this, vCur.determinePos(noPos), args, vCur); + } catch (ThrownError & e) { + // Distinguish between an error that simply happened while "throw" + // was being evaluated and an explicit thrown error. + if (fn->name == "throw") { + addErrorTrace(e, pos, "caused by explicit %s", "throw"); + } else { + addErrorTrace(e, pos, "while calling the '%s' builtin", fn->name); + } + throw; } catch (Error & e) { addErrorTrace(e, pos, "while calling the '%1%' builtin", fn->name); throw; diff --git a/tests/functional/eval.sh b/tests/functional/eval.sh index 9c125b569..ae6fcec63 100644 --- a/tests/functional/eval.sh +++ b/tests/functional/eval.sh @@ -25,7 +25,7 @@ nix eval -E 'assert 1 + 2 == 3; true' # Top-level eval errors should be printed to stderr with a traceback. topLevelThrow="$(expectStderr 1 nix eval --expr 'throw "a sample throw message"')" [[ "$topLevelThrow" =~ "a sample throw message" ]] -[[ "$topLevelThrow" =~ "while calling the 'throw' builtin" ]] +[[ "$topLevelThrow" =~ "caused by explicit throw" ]] # But errors inside something should print an elided version, and exit with 0. outputOfNestedThrow="$(nix eval --expr '{ throws = throw "a sample throw message"; }')" diff --git a/tests/functional/lang/eval-fail-duplicate-traces.err.exp b/tests/functional/lang/eval-fail-duplicate-traces.err.exp index cedaebd3b..d9e2ec945 100644 --- a/tests/functional/lang/eval-fail-duplicate-traces.err.exp +++ b/tests/functional/lang/eval-fail-duplicate-traces.err.exp @@ -41,7 +41,7 @@ error: | ^ 5| if n > 0 - … while calling the 'throw' builtin + … caused by explicit throw at /pwd/lang/eval-fail-duplicate-traces.nix:7:10: 6| then throwAfter (n - 1) 7| else throw "Uh oh!"; diff --git a/tests/functional/lang/eval-fail-foldlStrict-strict-op-application.err.exp b/tests/functional/lang/eval-fail-foldlStrict-strict-op-application.err.exp index 4903bc82d..6955fad13 100644 --- a/tests/functional/lang/eval-fail-foldlStrict-strict-op-application.err.exp +++ b/tests/functional/lang/eval-fail-foldlStrict-strict-op-application.err.exp @@ -27,7 +27,7 @@ error: | ^ 6| - … while calling the 'throw' builtin + … caused by explicit throw at /pwd/lang/eval-fail-foldlStrict-strict-op-application.nix:5:9: 4| null 5| [ (_: throw "Not the final value, but is still forced!") (_: 23) ] diff --git a/tests/functional/lang/eval-fail-mutual-recursion.err.exp b/tests/functional/lang/eval-fail-mutual-recursion.err.exp index c034afcd5..c03d2e840 100644 --- a/tests/functional/lang/eval-fail-mutual-recursion.err.exp +++ b/tests/functional/lang/eval-fail-mutual-recursion.err.exp @@ -54,7 +54,7 @@ error: (21 duplicate frames omitted) - … while calling the 'throw' builtin + … caused by explicit throw at /pwd/lang/eval-fail-mutual-recursion.nix:34:10: 33| then throwAfterB true 10 34| else throw "Uh oh!"; diff --git a/tests/functional/lang/eval-fail-not-throws.err.exp b/tests/functional/lang/eval-fail-not-throws.err.exp index fc81f7277..5882a260a 100644 --- a/tests/functional/lang/eval-fail-not-throws.err.exp +++ b/tests/functional/lang/eval-fail-not-throws.err.exp @@ -5,7 +5,7 @@ error: | ^ 2| - … while calling the 'throw' builtin + … caused by explicit throw at /pwd/lang/eval-fail-not-throws.nix:1:4: 1| ! (throw "uh oh!") | ^ diff --git a/tests/functional/lang/eval-fail-toJSON.err.exp b/tests/functional/lang/eval-fail-toJSON.err.exp index ad267711b..18c334923 100644 --- a/tests/functional/lang/eval-fail-toJSON.err.exp +++ b/tests/functional/lang/eval-fail-toJSON.err.exp @@ -40,7 +40,7 @@ error: | ^ 8| } - … while calling the 'throw' builtin + … caused by explicit throw at /pwd/lang/eval-fail-toJSON.nix:7:13: 6| { 7| c.d = throw "hah no";