report an error instead of crashing when attempting to baseline errors from files that are located outside of the project root

[DetachHead]

fixes #981

[github-actions]

Diff from mypy_primer, showing the effect of this PR on open source code:

sympy (https://github.com/sympy/sympy)
-   /tmp/mypy_primer/projects/sympy/sympy/stats/compound_rv.py:116:9 - warning: Return type, "Unknown | Zero | One | Probability | Self@Expr | tuple[Unknown, ...] | Sum | Expr | Any | NaN | Piecewise | Basic | Equality | int | NegativeOne | Integer | Rational | ComplexInfinity | Half | Infinity | NegativeInfinity | Float | Number", is partially unknown (reportUnknownParameterType)
+   /tmp/mypy_primer/projects/sympy/sympy/stats/compound_rv.py:116:9 - warning: Return type, "Unknown | Zero | One | Probability | Self@Expr | tuple[Unknown, ...] | Sum | Expr | Any | NaN | Piecewise | Basic | Equality | int | NegativeOne | Integer | Rational | ComplexInfinity | Half | Infinity | Number | NegativeInfinity", is partially unknown (reportUnknownParameterType)
-     Type of "probability" is "((condition: Unknown, **kwargs: Unknown) -> Unknown) | ((condition: Unknown) -> (Zero | One | Probability | Self@Expr | tuple[Unknown, ...] | Unknown | Sum | Expr | Any | NaN | Piecewise | Basic | Equality | int | NegativeOne | Integer | Rational | ComplexInfinity | Half | Infinity | NegativeInfinity | Float | Number)) | ((condition: Unknown) -> (NaN | Unknown | Piecewise | Integer | Literal[0]))" (reportUnknownMemberType)
+     Type of "probability" is "((condition: Unknown, **kwargs: Unknown) -> Unknown) | ((condition: Unknown) -> (Zero | One | Probability | Self@Expr | tuple[Unknown, ...] | Unknown | Sum | Expr | Any | NaN | Piecewise | Basic | Equality | int | NegativeOne | Integer | Rational | ComplexInfinity | Half | Infinity | Number | NegativeInfinity)) | ((condition: Unknown) -> (NaN | Unknown | Piecewise | Integer | Literal[0]))" (reportUnknownMemberType)
-   /tmp/mypy_primer/projects/sympy/sympy/stats/compound_rv.py:119:16 - warning: Return type, "Unknown | Zero | One | Probability | Self@Expr | tuple[Unknown, ...] | Sum | Expr | Any | NaN | Piecewise | Basic | Equality | int | NegativeOne | Integer | Rational | ComplexInfinity | Half | Infinity | NegativeInfinity | Float | Number", is partially unknown (reportUnknownVariableType)
+   /tmp/mypy_primer/projects/sympy/sympy/stats/compound_rv.py:119:16 - warning: Return type, "Unknown | Zero | One | Probability | Self@Expr | tuple[Unknown, ...] | Sum | Expr | Any | NaN | Piecewise | Basic | Equality | int | NegativeOne | Integer | Rational | ComplexInfinity | Half | Infinity | Number | NegativeInfinity", is partially unknown (reportUnknownVariableType)
-     Type of "doit" is "((**hints: Unknown) -> Equality) | Unknown | ((**hints: Unknown) -> NaN) | ((**hints: Unknown) -> (tuple[Unknown, ...] | Unknown | Sum | Self@Expr | Expr | Any | Zero | NaN | Piecewise | Basic | None)) | ((**hints: Unknown) -> Unknown)" (reportUnknownMemberType)
+     Type of "doit" is "((**hints: Unknown) -> Equality) | Unknown | ((**hints: Unknown) -> NaN) | ((**hints: Unknown) -> (tuple[Unknown, ...] | Unknown | Sum | Self@Expr | Expr | Any | Zero | NaN | Piecewise | Basic | Equality | None)) | ((**hints: Unknown) -> Unknown)" (reportUnknownMemberType)
-     Type of "summation" is "(f: Unknown, ...) -> (tuple[Unknown, ...] | Unknown | Self@Sum | Self@Expr | Expr | Any | Zero | NaN | Piecewise | Basic | Equality | None)" (reportUnknownVariableType)
+     Type of "summation" is "(f: Unknown, ...) -> (tuple[Unknown, ...] | Unknown | Self@Sum | Self@Expr | Expr | Any | Zero | NaN | Piecewise | Basic | Equality | Sum | None)" (reportUnknownVariableType)
-   /tmp/mypy_primer/projects/sympy/sympy/stats/drv.py:228:9 - warning: Return type, "Zero | One | Probability | Self@Expr | tuple[Unknown, ...] | Unknown | Sum | Expr | Any | NaN | Piecewise | Basic | Equality | int | NegativeOne | Integer | Rational | ComplexInfinity | Half | Infinity | NegativeInfinity | Float | Number", is partially unknown (reportUnknownParameterType)
+   /tmp/mypy_primer/projects/sympy/sympy/stats/drv.py:228:9 - warning: Return type, "Zero | One | Probability | Self@Expr | tuple[Unknown, ...] | Unknown | Sum | Expr | Any | NaN | Piecewise | Basic | Equality | int | NegativeOne | Integer | Rational | ComplexInfinity | Half | Infinity | Number | NegativeInfinity", is partially unknown (reportUnknownParameterType)
-     Type of "density" is "(expr: Unknown, condition: Unknown | None = None, evaluate: bool = True, numsamples: Unknown | None = None, **kwargs: Unknown) -> Unknown" (reportUnknownVariableType)
+     Type of "density" is "(expr: Unknown, condition: Unknown | None = None, evaluate: bool = True, numsamples: Unknown | None = None, **kwargs: Unknown) -> (dict[Unknown, Unknown] | Density | Lambda | Basic | Any | Unknown | FiniteDensity | None)" (reportUnknownVariableType)
-   /tmp/mypy_primer/projects/sympy/sympy/stats/drv.py:242:13 - warning: Type of "dens" is unknown (reportUnknownVariableType)
+   /tmp/mypy_primer/projects/sympy/sympy/stats/drv.py:242:13 - warning: Type of "dens" is partially unknown
+     Type of "dens" is "dict[Unknown, Unknown] | Density | Lambda | Basic | Any | Unknown | FiniteDensity | None" (reportUnknownVariableType)
-   /tmp/mypy_primer/projects/sympy/sympy/stats/drv.py:245:53 - warning: Argument type is unknown
-     Argument corresponds to parameter "pdf" in function "__new__" (reportUnknownArgumentType)
-   /tmp/mypy_primer/projects/sympy/sympy/stats/drv.py:251:16 - warning: Return type, "Probability | Self@Expr | tuple[Unknown, ...] | Unknown | Sum | Expr | Any | Zero | NaN | Piecewise | Basic | Equality | int | One | NegativeOne | Integer | Rational | ComplexInfinity | Half | Infinity | NegativeInfinity | Float | Number", is partially unknown (reportUnknownVariableType)
+   /tmp/mypy_primer/projects/sympy/sympy/stats/drv.py:251:16 - warning: Return type, "Probability | Self@Expr | tuple[Unknown, ...] | Unknown | Sum | Expr | Any | Zero | NaN | Piecewise | Basic | Equality | int | One | NegativeOne | Integer | Rational | ComplexInfinity | Half | Infinity | Number | NegativeInfinity", is partially unknown (reportUnknownVariableType)
-     Type of "doit" is "Unknown | ((**hints: Unknown) -> (tuple[Unknown, ...] | Unknown | Sum | Self@Expr | Expr | Any | Zero | NaN | Piecewise | Basic | None)) | ((**hints: Unknown) -> Self@Expr) | ((**hints: Unknown) -> Expr) | Any | ((**hints: Unknown) -> Zero) | ((**hints: Unknown) -> NaN) | ((**hints: Unknown) -> Piecewise) | ((**hints: Unknown) -> Basic) | ((**hints: Unknown) -> Equality)" (reportUnknownMemberType)
+     Type of "doit" is "Unknown | ((**hints: Unknown) -> (tuple[Unknown, ...] | Unknown | Sum | Self@Expr | Expr | Any | Zero | NaN | Piecewise | Basic | Equality | None)) | ((**hints: Unknown) -> Self@Expr) | ((**hints: Unknown) -> Expr) | Any | ((**hints: Unknown) -> Zero) | ((**hints: Unknown) -> NaN) | ((**hints: Unknown) -> Piecewise) | ((**hints: Unknown) -> Basic) | ((**hints: Unknown) -> Equality)" (reportUnknownMemberType)
-     Type of "probability" is "(condition: Unknown) -> (Zero | One | Probability | Self@Expr | tuple[Unknown, ...] | Unknown | Sum | Expr | Any | NaN | Piecewise | Basic | Equality | int | NegativeOne | Integer | Rational | ComplexInfinity | Half | Infinity | NegativeInfinity | Float | Number)" (reportUnknownMemberType)
+     Type of "probability" is "(condition: Unknown) -> Unknown" (reportUnknownMemberType)
-     Type of "doit" is "((**hints: Unknown) -> Equality) | Unknown | ((**hints: Unknown) -> NaN) | ((**hints: Unknown) -> (tuple[Unknown, ...] | Unknown | Sum | Self@Expr | Expr | Any | Zero | NaN | Piecewise | Basic | None))" (reportUnknownMemberType)
+     Type of "doit" is "((**hints: Unknown) -> Equality) | Unknown | ((**hints: Unknown) -> NaN) | ((**hints: Unknown) -> (tuple[Unknown, ...] | Unknown | Sum | Self@Expr | Expr | Any | Zero | NaN | Piecewise | Basic | Equality | None))" (reportUnknownMemberType)
-     Type of "doit" is "((**hints: Unknown) -> Equality) | Unknown | ((**hints: Unknown) -> NaN) | ((**hints: Unknown) -> (tuple[Unknown, ...] | Unknown | Sum | Self@Expr | Expr | Any | Zero | NaN | Piecewise | Basic | None))" (reportUnknownMemberType)
+     Type of "doit" is "((**hints: Unknown) -> Equality) | Unknown | ((**hints: Unknown) -> NaN) | ((**hints: Unknown) -> (tuple[Unknown, ...] | Unknown | Sum | Self@Expr | Expr | Any | Zero | NaN | Piecewise | Basic | Equality | None))" (reportUnknownMemberType)
-     Type of "_test" is "(elem: Unknown) -> (bool | Unknown)" (reportUnknownMemberType)
+     Type of "_test" is "(elem: Unknown) -> Unknown" (reportUnknownMemberType)
-     Type of "doit" is "((**hints: Unknown) -> Equality) | Unknown | ((**hints: Unknown) -> NaN) | ((**hints: Unknown) -> (tuple[Unknown, ...] | Unknown | Sum | Self@Expr | Expr | Any | Zero | NaN | Piecewise | Basic | None))" (reportUnknownMemberType)
+     Type of "doit" is "((**hints: Unknown) -> Equality) | Unknown | ((**hints: Unknown) -> NaN) | ((**hints: Unknown) -> (tuple[Unknown, ...] | Unknown | Sum | Self@Expr | Expr | Any | Zero | NaN | Piecewise | Basic | Equality | None))" (reportUnknownMemberType)
-     Type of "summation" is "(f: Unknown, ...) -> (tuple[Unknown, ...] | Unknown | Self@Sum | Self@Expr | Expr | Any | Zero | NaN | Piecewise | Basic | Equality | None)" (reportUnknownVariableType)
+     Type of "summation" is "(f: Unknown, ...) -> (tuple[Unknown, ...] | Unknown | Self@Sum | Self@Expr | Expr | Any | Zero | NaN | Piecewise | Basic | Equality | Sum | None)" (reportUnknownVariableType)
+   /tmp/mypy_primer/projects/sympy/sympy/stats/joint_rv_types.py:285:9 - warning: Type of "v" is partially unknown
+     Type of "v" is "Expr | Rational | NaN | ComplexInfinity | One | NegativeOne | Zero | Integer | Half | Unknown | NegativeInfinity | Number | Infinity | int" (reportUnknownVariableType)
+   /tmp/mypy_primer/projects/sympy/sympy/stats/joint_rv_types.py:574:29 - warning: Argument type is partially unknown
+     Argument corresponds to parameter "args" in function "__new__"

... (truncated 3823 lines) ...

spack (https://github.com/spack/spack)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/u/package.py:10:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/u/package.py:10:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/u/package.py:12:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/u/package.py:12:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/v/package.py:11:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/v/package.py:11:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/v/package.py:13:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/v/package.py:13:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/w/package.py:13:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/w/package.py:13:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/w/package.py:14:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/w/package.py:14:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/w/package.py:15:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/w/package.py:15:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/w/package.py:17:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/w/package.py:17:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/x/package.py:12:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/x/package.py:12:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/x/package.py:13:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/x/package.py:13:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/x/package.py:15:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/x/package.py:15:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/y/package.py:11:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/flags.test/packages/y/package.py:11:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/requirements.test/packages/t/package.py:11:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/requirements.test/packages/t/package.py:11:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/requirements.test/packages/t/package.py:13:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/requirements.test/packages/t/package.py:13:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/requirements.test/packages/u/package.py:11:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/requirements.test/packages/u/package.py:11:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/requirements.test/packages/v/package.py:11:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/requirements.test/packages/v/package.py:11:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/requirements.test/packages/x/package.py:14:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/requirements.test/packages/x/package.py:14:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/requirements.test/packages/x/package.py:15:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
+   /tmp/mypy_primer/projects/spack/var/spack/repos/requirements.test/packages/x/package.py:15:5 - warning: Result of call expression is of type "(pkg: type[PackageBase]) -> None" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)
-   /tmp/mypy_primer/projects/spack/var/spack/repos/requirements.test/packages/y/package.py:14:5 - warning: Result of call expression is of type "((pkg: type[PackageBase]) -> None)" and is not used; assign to variable "_" if this is intentional (reportUnusedCallResult)

... (truncated 45 lines) ...