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Revert "Print the value in error: cannot coerce messages (#9553)"

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This reverts commit f0ac2a35d5.

The request from the sibling PR, which also applies here, was not addressed.
https://github.com/NixOS/nix/pull/9554#issuecomment-1845095735
This commit is contained in:
Robert Hensing 2023-12-09 02:13:32 +01:00
parent d4f6b1d38b
commit 9b7b7a7561
6 changed files with 21 additions and 73 deletions
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50
doc/manual/rl-next/print-value-in-coercion-error.md
View file

@ -1,50 +0,0 @@
synopsis: Coercion errors include the failing value
issues: #561
prs: #9553
description: {
The `error: cannot coerce a <TYPE> to a string` message now includes the value which caused the error.
Previously, a failed string coercion produced a confusing error message if the trace didn't show where the offending value was defined:
```bash
$ nix-instantiate --eval --expr '
let x = { a = 1; }; in
"${x}"
'
error:
… while evaluating a path segment
at «string»:4:2:
3|
4| "${x}"
| ^
5|
error: cannot coerce a set to a string
```
Now, the error message includes the value itself:
```bash
$ nix-instantiate --eval --expr '
let x = { a = 1; }; in
"${x}"
'
error:
… while evaluating a path segment
at «string»:4:2:
3|
4| "${x}"
| ^
5|
error: cannot coerce a set to a string: { a = 1; }
```
}

2
doc/manual/src/language/string-interpolation.md
View file

@ -189,7 +189,7 @@ If neither is present, an error is thrown.
> "${a}" > "${a}"
> ``` > ```
> >
> error: cannot coerce a set to a string: { } > error: cannot coerce a set to a string
> >
> at «string»:4:2: > at «string»:4:2:
> >

10
src/libexpr/eval.cc
View file

@ -27,9 +27,9 @@
#include <unistd.h> #include <unistd.h>
#include <sys/time.h> #include <sys/time.h>
#include <sys/resource.h> #include <sys/resource.h>
#include <iostream>
#include <fstream> #include <fstream>
#include <functional> #include <functional>
#include <sstream>
#include <sys/resource.h> #include <sys/resource.h>
#include <nlohmann/json.hpp> #include <nlohmann/json.hpp>
@ -2230,7 +2230,7 @@ BackedStringView EvalState::coerceToString(
return std::move(*maybeString); return std::move(*maybeString);
auto i = v.attrs->find(sOutPath); auto i = v.attrs->find(sOutPath);
if (i == v.attrs->end()) { if (i == v.attrs->end()) {
error("cannot coerce %1% to a string: %2%", showType(v), printValue(*this, v)) error("cannot coerce %1% to a string", showType(v))
.withTrace(pos, errorCtx) .withTrace(pos, errorCtx)
.debugThrow<TypeError>(); .debugThrow<TypeError>();
} }
@ -2276,7 +2276,7 @@ BackedStringView EvalState::coerceToString(
} }
} }
error("cannot coerce %1% to a string: %2%", showType(v), printValue(*this, v)) error("cannot coerce %1% to a string", showType(v))
.withTrace(pos, errorCtx) .withTrace(pos, errorCtx)
.debugThrow<TypeError>(); .debugThrow<TypeError>();
} }
@ -2635,10 +2635,8 @@ void EvalState::printStatistics()
std::string ExternalValueBase::coerceToString(const Pos & pos, NixStringContext & context, bool copyMore, bool copyToStore) const std::string ExternalValueBase::coerceToString(const Pos & pos, NixStringContext & context, bool copyMore, bool copyToStore) const
{ {
std::stringstream printed;
print(printed);
throw TypeError({ throw TypeError({
.msg = hintfmt("cannot coerce %1% to a string: %2%", showType(), printed.str()) .msg = hintfmt("cannot coerce %1% to a string", showType())
}); });
} }

2
tests/functional/lang/eval-fail-bad-string-interpolation-1.err.exp
View file

@ -7,4 +7,4 @@ error:
| ^ | ^
2| 2|
error: cannot coerce a function to a string: <LAMBDA> error: cannot coerce a function to a string

2
tests/functional/lang/eval-fail-bad-string-interpolation-3.err.exp
View file

@ -7,4 +7,4 @@ error:
| ^ | ^
2| 2|
error: cannot coerce a function to a string: <LAMBDA> error: cannot coerce a function to a string

28
tests/unit/libexpr/error_traces.cc
View file

@ -295,7 +295,7 @@ namespace nix {
TEST_F(ErrorTraceTest, toPath) { TEST_F(ErrorTraceTest, toPath) {
ASSERT_TRACE2("toPath []", ASSERT_TRACE2("toPath []",
TypeError, TypeError,
hintfmt("cannot coerce %s to a string: %s", "a list", "[ ]"), hintfmt("cannot coerce %s to a string", "a list"),
hintfmt("while evaluating the first argument passed to builtins.toPath")); hintfmt("while evaluating the first argument passed to builtins.toPath"));
ASSERT_TRACE2("toPath \"foo\"", ASSERT_TRACE2("toPath \"foo\"",
@ -309,7 +309,7 @@ namespace nix {
TEST_F(ErrorTraceTest, storePath) { TEST_F(ErrorTraceTest, storePath) {
ASSERT_TRACE2("storePath true", ASSERT_TRACE2("storePath true",
TypeError, TypeError,
hintfmt("cannot coerce %s to a string: %s", "a Boolean", "true"), hintfmt("cannot coerce %s to a string", "a Boolean"),
hintfmt("while evaluating the first argument passed to 'builtins.storePath'")); hintfmt("while evaluating the first argument passed to 'builtins.storePath'"));
} }
@ -318,7 +318,7 @@ namespace nix {
TEST_F(ErrorTraceTest, pathExists) { TEST_F(ErrorTraceTest, pathExists) {
ASSERT_TRACE2("pathExists []", ASSERT_TRACE2("pathExists []",
TypeError, TypeError,
hintfmt("cannot coerce %s to a string: %s", "a list", "[ ]"), hintfmt("cannot coerce %s to a string", "a list"),
hintfmt("while realising the context of a path")); hintfmt("while realising the context of a path"));
ASSERT_TRACE2("pathExists \"zorglub\"", ASSERT_TRACE2("pathExists \"zorglub\"",
@ -332,7 +332,7 @@ namespace nix {
TEST_F(ErrorTraceTest, baseNameOf) { TEST_F(ErrorTraceTest, baseNameOf) {
ASSERT_TRACE2("baseNameOf []", ASSERT_TRACE2("baseNameOf []",
TypeError, TypeError,
hintfmt("cannot coerce %s to a string: %s", "a list", "[ ]"), hintfmt("cannot coerce %s to a string", "a list"),
hintfmt("while evaluating the first argument passed to builtins.baseNameOf")); hintfmt("while evaluating the first argument passed to builtins.baseNameOf"));
} }
@ -377,7 +377,7 @@ namespace nix {
TEST_F(ErrorTraceTest, filterSource) { TEST_F(ErrorTraceTest, filterSource) {
ASSERT_TRACE2("filterSource [] []", ASSERT_TRACE2("filterSource [] []",
TypeError, TypeError,
hintfmt("cannot coerce %s to a string: %s", "a list", "[ ]"), hintfmt("cannot coerce %s to a string", "a list"),
hintfmt("while evaluating the second argument (the path to filter) passed to 'builtins.filterSource'")); hintfmt("while evaluating the second argument (the path to filter) passed to 'builtins.filterSource'"));
ASSERT_TRACE2("filterSource [] \"foo\"", ASSERT_TRACE2("filterSource [] \"foo\"",
@ -1038,7 +1038,7 @@ namespace nix {
TEST_F(ErrorTraceTest, toString) { TEST_F(ErrorTraceTest, toString) {
ASSERT_TRACE2("toString { a = 1; }", ASSERT_TRACE2("toString { a = 1; }",
TypeError, TypeError,
hintfmt("cannot coerce %s to a string: %s", "a set", "{ a = 1; }"), hintfmt("cannot coerce %s to a string", "a set"),
hintfmt("while evaluating the first argument passed to builtins.toString")); hintfmt("while evaluating the first argument passed to builtins.toString"));
} }
@ -1057,7 +1057,7 @@ namespace nix {
ASSERT_TRACE2("substring 0 3 {}", ASSERT_TRACE2("substring 0 3 {}",
TypeError, TypeError,
hintfmt("cannot coerce %s to a string: %s", "a set", "{ }"), hintfmt("cannot coerce %s to a string", "a set"),
hintfmt("while evaluating the third argument (the string) passed to builtins.substring")); hintfmt("while evaluating the third argument (the string) passed to builtins.substring"));
ASSERT_TRACE1("substring (-3) 3 \"sometext\"", ASSERT_TRACE1("substring (-3) 3 \"sometext\"",
@ -1070,7 +1070,7 @@ namespace nix {
TEST_F(ErrorTraceTest, stringLength) { TEST_F(ErrorTraceTest, stringLength) {
ASSERT_TRACE2("stringLength {} # TODO: context is missing ???", ASSERT_TRACE2("stringLength {} # TODO: context is missing ???",
TypeError, TypeError,
hintfmt("cannot coerce %s to a string: %s", "a set", "{ }"), hintfmt("cannot coerce %s to a string", "a set"),
hintfmt("while evaluating the argument passed to builtins.stringLength")); hintfmt("while evaluating the argument passed to builtins.stringLength"));
} }
@ -1143,7 +1143,7 @@ namespace nix {
ASSERT_TRACE2("concatStringsSep \"foo\" [ 1 2 {} ] # TODO: coerce to string is buggy", ASSERT_TRACE2("concatStringsSep \"foo\" [ 1 2 {} ] # TODO: coerce to string is buggy",
TypeError, TypeError,
hintfmt("cannot coerce %s to a string: %s", "an integer", "1"), hintfmt("cannot coerce %s to a string", "an integer"),
hintfmt("while evaluating one element of the list of strings to concat passed to builtins.concatStringsSep")); hintfmt("while evaluating one element of the list of strings to concat passed to builtins.concatStringsSep"));
} }
@ -1229,12 +1229,12 @@ namespace nix {
ASSERT_TRACE2("derivationStrict { name = \"foo\"; builder = 1; system = {}; }", ASSERT_TRACE2("derivationStrict { name = \"foo\"; builder = 1; system = {}; }",
TypeError, TypeError,
hintfmt("cannot coerce %s to a string: %s", "a set", "{ }"), hintfmt("cannot coerce %s to a string", "a set"),
hintfmt("while evaluating the attribute 'system' of derivation 'foo'")); hintfmt("while evaluating the attribute 'system' of derivation 'foo'"));
ASSERT_TRACE2("derivationStrict { name = \"foo\"; builder = 1; system = 1; outputs = {}; }", ASSERT_TRACE2("derivationStrict { name = \"foo\"; builder = 1; system = 1; outputs = {}; }",
TypeError, TypeError,
hintfmt("cannot coerce %s to a string: %s", "a set", "{ }"), hintfmt("cannot coerce %s to a string", "a set"),
hintfmt("while evaluating the attribute 'outputs' of derivation 'foo'")); hintfmt("while evaluating the attribute 'outputs' of derivation 'foo'"));
ASSERT_TRACE2("derivationStrict { name = \"foo\"; builder = 1; system = 1; outputs = \"drv\"; }", ASSERT_TRACE2("derivationStrict { name = \"foo\"; builder = 1; system = 1; outputs = \"drv\"; }",
@ -1279,17 +1279,17 @@ namespace nix {
ASSERT_TRACE2("derivationStrict { name = \"foo\"; builder = 1; system = 1; outputs = \"out\"; args = [ {} ]; }", ASSERT_TRACE2("derivationStrict { name = \"foo\"; builder = 1; system = 1; outputs = \"out\"; args = [ {} ]; }",
TypeError, TypeError,
hintfmt("cannot coerce %s to a string: %s", "a set", "{ }"), hintfmt("cannot coerce %s to a string", "a set"),
hintfmt("while evaluating an element of the argument list")); hintfmt("while evaluating an element of the argument list"));
ASSERT_TRACE2("derivationStrict { name = \"foo\"; builder = 1; system = 1; outputs = \"out\"; args = [ \"a\" {} ]; }", ASSERT_TRACE2("derivationStrict { name = \"foo\"; builder = 1; system = 1; outputs = \"out\"; args = [ \"a\" {} ]; }",
TypeError, TypeError,
hintfmt("cannot coerce %s to a string: %s", "a set", "{ }"), hintfmt("cannot coerce %s to a string", "a set"),
hintfmt("while evaluating an element of the argument list")); hintfmt("while evaluating an element of the argument list"));
ASSERT_TRACE2("derivationStrict { name = \"foo\"; builder = 1; system = 1; outputs = \"out\"; FOO = {}; }", ASSERT_TRACE2("derivationStrict { name = \"foo\"; builder = 1; system = 1; outputs = \"out\"; FOO = {}; }",
TypeError, TypeError,
hintfmt("cannot coerce %s to a string: %s", "a set", "{ }"), hintfmt("cannot coerce %s to a string", "a set"),
hintfmt("while evaluating the attribute 'FOO' of derivation 'foo'")); hintfmt("while evaluating the attribute 'FOO' of derivation 'foo'"));
} }