From 1e31bd57764bc0972fd00aa50fe01c360966912d Mon Sep 17 00:00:00 2001
From: FreezyLemon <contact@freezylemon.com>
Date: Fri, 6 Dec 2024 17:31:08 +0100
Subject: [PATCH] chore: only implement Error with feature "std"

`core::error` needs an MSRV of 1.81,
which is a bit too new for this crate
---
 src/distribution/beta.rs                    | 1 +
 src/distribution/binomial.rs                | 1 +
 src/distribution/categorical.rs             | 1 +
 src/distribution/cauchy.rs                  | 1 +
 src/distribution/chi.rs                     | 1 +
 src/distribution/dirac.rs                   | 1 +
 src/distribution/dirichlet.rs               | 1 +
 src/distribution/discrete_uniform.rs        | 1 +
 src/distribution/exponential.rs             | 1 +
 src/distribution/fisher_snedecor.rs         | 1 +
 src/distribution/gamma.rs                   | 1 +
 src/distribution/geometric.rs               | 1 +
 src/distribution/gumbel.rs                  | 1 +
 src/distribution/hypergeometric.rs          | 1 +
 src/distribution/inverse_gamma.rs           | 1 +
 src/distribution/laplace.rs                 | 1 +
 src/distribution/log_normal.rs              | 1 +
 src/distribution/multinomial.rs             | 1 +
 src/distribution/multivariate_normal.rs     | 1 +
 src/distribution/multivariate_students_t.rs | 1 +
 src/distribution/negative_binomial.rs       | 1 +
 src/distribution/normal.rs                  | 1 +
 src/distribution/pareto.rs                  | 1 +
 src/distribution/poisson.rs                 | 1 +
 src/distribution/students_t.rs              | 1 +
 src/distribution/triangular.rs              | 1 +
 src/distribution/uniform.rs                 | 1 +
 src/distribution/weibull.rs                 | 1 +
 src/function/beta.rs                        | 1 +
 src/function/gamma.rs                       | 1 +
 src/stats_tests/fisher.rs                   | 1 +
 31 files changed, 31 insertions(+)

diff --git a/src/distribution/beta.rs b/src/distribution/beta.rs
index c2b567d6..e2ec79e5 100644
--- a/src/distribution/beta.rs
+++ b/src/distribution/beta.rs
@@ -43,6 +43,7 @@ impl core::fmt::Display for BetaError {
     }
 }
 
+#[cfg(feature = "std")]
 impl std::error::Error for BetaError {}
 
 impl Beta {
diff --git a/src/distribution/binomial.rs b/src/distribution/binomial.rs
index 11140780..5326f5d5 100644
--- a/src/distribution/binomial.rs
+++ b/src/distribution/binomial.rs
@@ -41,6 +41,7 @@ impl core::fmt::Display for BinomialError {
     }
 }
 
+#[cfg(feature = "std")]
 impl std::error::Error for BinomialError {}
 
 impl Binomial {
diff --git a/src/distribution/categorical.rs b/src/distribution/categorical.rs
index 8a1b9373..4d153d9b 100644
--- a/src/distribution/categorical.rs
+++ b/src/distribution/categorical.rs
@@ -53,6 +53,7 @@ impl core::fmt::Display for CategoricalError {
     }
 }
 
+#[cfg(feature = "std")]
 impl std::error::Error for CategoricalError {}
 
 impl Categorical {
diff --git a/src/distribution/cauchy.rs b/src/distribution/cauchy.rs
index 22e35b08..7a7f68b0 100644
--- a/src/distribution/cauchy.rs
+++ b/src/distribution/cauchy.rs
@@ -42,6 +42,7 @@ impl core::fmt::Display for CauchyError {
     }
 }
 
+#[cfg(feature = "std")]
 impl std::error::Error for CauchyError {}
 
 impl Cauchy {
diff --git a/src/distribution/chi.rs b/src/distribution/chi.rs
index ea553354..85e7c348 100644
--- a/src/distribution/chi.rs
+++ b/src/distribution/chi.rs
@@ -42,6 +42,7 @@ impl core::fmt::Display for ChiError {
     }
 }
 
+#[cfg(feature = "std")]
 impl std::error::Error for ChiError {}
 
 impl Chi {
diff --git a/src/distribution/dirac.rs b/src/distribution/dirac.rs
index d18ea733..c2a7913e 100644
--- a/src/distribution/dirac.rs
+++ b/src/distribution/dirac.rs
@@ -33,6 +33,7 @@ impl core::fmt::Display for DiracError {
     }
 }
 
+#[cfg(feature = "std")]
 impl std::error::Error for DiracError {}
 
 impl Dirac {
diff --git a/src/distribution/dirichlet.rs b/src/distribution/dirichlet.rs
index 4e7cebf1..2af8193a 100644
--- a/src/distribution/dirichlet.rs
+++ b/src/distribution/dirichlet.rs
@@ -54,6 +54,7 @@ impl core::fmt::Display for DirichletError {
     }
 }
 
+#[cfg(feature = "std")]
 impl std::error::Error for DirichletError {}
 
 impl Dirichlet<Dyn> {
diff --git a/src/distribution/discrete_uniform.rs b/src/distribution/discrete_uniform.rs
index b0193bac..f47ae4c7 100644
--- a/src/distribution/discrete_uniform.rs
+++ b/src/distribution/discrete_uniform.rs
@@ -38,6 +38,7 @@ impl core::fmt::Display for DiscreteUniformError {
     }
 }
 
+#[cfg(feature = "std")]
 impl std::error::Error for DiscreteUniformError {}
 
 impl DiscreteUniform {
diff --git a/src/distribution/exponential.rs b/src/distribution/exponential.rs
index a31d7876..0af1e53a 100644
--- a/src/distribution/exponential.rs
+++ b/src/distribution/exponential.rs
@@ -40,6 +40,7 @@ impl core::fmt::Display for ExpError {
     }
 }
 
+#[cfg(feature = "std")]
 impl std::error::Error for ExpError {}
 
 impl Exp {
diff --git a/src/distribution/fisher_snedecor.rs b/src/distribution/fisher_snedecor.rs
index 0f8453d5..78b0b56d 100644
--- a/src/distribution/fisher_snedecor.rs
+++ b/src/distribution/fisher_snedecor.rs
@@ -49,6 +49,7 @@ impl core::fmt::Display for FisherSnedecorError {
     }
 }
 
+#[cfg(feature = "std")]
 impl std::error::Error for FisherSnedecorError {}
 
 impl FisherSnedecor {
diff --git a/src/distribution/gamma.rs b/src/distribution/gamma.rs
index 1251f504..eebeeef9 100644
--- a/src/distribution/gamma.rs
+++ b/src/distribution/gamma.rs
@@ -48,6 +48,7 @@ impl core::fmt::Display for GammaError {
     }
 }
 
+#[cfg(feature = "std")]
 impl std::error::Error for GammaError {}
 
 impl Gamma {
diff --git a/src/distribution/geometric.rs b/src/distribution/geometric.rs
index f7b93408..0ccce76c 100644
--- a/src/distribution/geometric.rs
+++ b/src/distribution/geometric.rs
@@ -39,6 +39,7 @@ impl core::fmt::Display for GeometricError {
     }
 }
 
+#[cfg(feature = "std")]
 impl std::error::Error for GeometricError {}
 
 impl Geometric {
diff --git a/src/distribution/gumbel.rs b/src/distribution/gumbel.rs
index 48a5dd68..d224230c 100644
--- a/src/distribution/gumbel.rs
+++ b/src/distribution/gumbel.rs
@@ -45,6 +45,7 @@ impl core::fmt::Display for GumbelError {
     }
 }
 
+#[cfg(feature = "std")]
 impl std::error::Error for GumbelError {}
 
 impl Gumbel {
diff --git a/src/distribution/hypergeometric.rs b/src/distribution/hypergeometric.rs
index b88d7e1e..b599f4d7 100644
--- a/src/distribution/hypergeometric.rs
+++ b/src/distribution/hypergeometric.rs
@@ -48,6 +48,7 @@ impl core::fmt::Display for HypergeometricError {
     }
 }
 
+#[cfg(feature = "std")]
 impl std::error::Error for HypergeometricError {}
 
 impl Hypergeometric {
diff --git a/src/distribution/inverse_gamma.rs b/src/distribution/inverse_gamma.rs
index c359843b..3cdd6d84 100644
--- a/src/distribution/inverse_gamma.rs
+++ b/src/distribution/inverse_gamma.rs
@@ -49,6 +49,7 @@ impl core::fmt::Display for InverseGammaError {
     }
 }
 
+#[cfg(feature = "std")]
 impl std::error::Error for InverseGammaError {}
 
 impl InverseGamma {
diff --git a/src/distribution/laplace.rs b/src/distribution/laplace.rs
index 31d3fb5c..9c8052d8 100644
--- a/src/distribution/laplace.rs
+++ b/src/distribution/laplace.rs
@@ -42,6 +42,7 @@ impl core::fmt::Display for LaplaceError {
     }
 }
 
+#[cfg(feature = "std")]
 impl std::error::Error for LaplaceError {}
 
 impl Laplace {
diff --git a/src/distribution/log_normal.rs b/src/distribution/log_normal.rs
index 447173f9..9704b0ac 100644
--- a/src/distribution/log_normal.rs
+++ b/src/distribution/log_normal.rs
@@ -46,6 +46,7 @@ impl core::fmt::Display for LogNormalError {
     }
 }
 
+#[cfg(feature = "std")]
 impl std::error::Error for LogNormalError {}
 
 impl LogNormal {
diff --git a/src/distribution/multinomial.rs b/src/distribution/multinomial.rs
index a96c483b..fc4437ba 100644
--- a/src/distribution/multinomial.rs
+++ b/src/distribution/multinomial.rs
@@ -59,6 +59,7 @@ impl core::fmt::Display for MultinomialError {
     }
 }
 
+#[cfg(feature = "std")]
 impl std::error::Error for MultinomialError {}
 
 impl Multinomial<Dyn> {
diff --git a/src/distribution/multivariate_normal.rs b/src/distribution/multivariate_normal.rs
index 7d1a0ea8..9b61a923 100644
--- a/src/distribution/multivariate_normal.rs
+++ b/src/distribution/multivariate_normal.rs
@@ -135,6 +135,7 @@ impl core::fmt::Display for MultivariateNormalError {
     }
 }
 
+#[cfg(feature = "std")]
 impl std::error::Error for MultivariateNormalError {}
 
 impl MultivariateNormal<Dyn> {
diff --git a/src/distribution/multivariate_students_t.rs b/src/distribution/multivariate_students_t.rs
index 8bf75755..9d3dfd21 100644
--- a/src/distribution/multivariate_students_t.rs
+++ b/src/distribution/multivariate_students_t.rs
@@ -82,6 +82,7 @@ impl core::fmt::Display for MultivariateStudentError {
     }
 }
 
+#[cfg(feature = "std")]
 impl std::error::Error for MultivariateStudentError {}
 
 impl MultivariateStudent<Dyn> {
diff --git a/src/distribution/negative_binomial.rs b/src/distribution/negative_binomial.rs
index d28c0e23..c1c62884 100644
--- a/src/distribution/negative_binomial.rs
+++ b/src/distribution/negative_binomial.rs
@@ -60,6 +60,7 @@ impl core::fmt::Display for NegativeBinomialError {
     }
 }
 
+#[cfg(feature = "std")]
 impl std::error::Error for NegativeBinomialError {}
 
 impl NegativeBinomial {
diff --git a/src/distribution/normal.rs b/src/distribution/normal.rs
index f93bd279..4f14b248 100644
--- a/src/distribution/normal.rs
+++ b/src/distribution/normal.rs
@@ -46,6 +46,7 @@ impl core::fmt::Display for NormalError {
     }
 }
 
+#[cfg(feature = "std")]
 impl std::error::Error for NormalError {}
 
 impl Normal {
diff --git a/src/distribution/pareto.rs b/src/distribution/pareto.rs
index 75d035a2..efa358de 100644
--- a/src/distribution/pareto.rs
+++ b/src/distribution/pareto.rs
@@ -43,6 +43,7 @@ impl core::fmt::Display for ParetoError {
     }
 }
 
+#[cfg(feature = "std")]
 impl std::error::Error for ParetoError {}
 
 impl Pareto {
diff --git a/src/distribution/poisson.rs b/src/distribution/poisson.rs
index 27f4ff36..986634c3 100644
--- a/src/distribution/poisson.rs
+++ b/src/distribution/poisson.rs
@@ -39,6 +39,7 @@ impl core::fmt::Display for PoissonError {
     }
 }
 
+#[cfg(feature = "std")]
 impl std::error::Error for PoissonError {}
 
 impl Poisson {
diff --git a/src/distribution/students_t.rs b/src/distribution/students_t.rs
index 5731edeb..c144b459 100644
--- a/src/distribution/students_t.rs
+++ b/src/distribution/students_t.rs
@@ -51,6 +51,7 @@ impl core::fmt::Display for StudentsTError {
     }
 }
 
+#[cfg(feature = "std")]
 impl std::error::Error for StudentsTError {}
 
 impl StudentsT {
diff --git a/src/distribution/triangular.rs b/src/distribution/triangular.rs
index 89191ae2..77d9223d 100644
--- a/src/distribution/triangular.rs
+++ b/src/distribution/triangular.rs
@@ -58,6 +58,7 @@ impl core::fmt::Display for TriangularError {
     }
 }
 
+#[cfg(feature = "std")]
 impl std::error::Error for TriangularError {}
 
 impl Triangular {
diff --git a/src/distribution/uniform.rs b/src/distribution/uniform.rs
index 462073bc..f13f74d1 100644
--- a/src/distribution/uniform.rs
+++ b/src/distribution/uniform.rs
@@ -49,6 +49,7 @@ impl core::fmt::Display for UniformError {
     }
 }
 
+#[cfg(feature = "std")]
 impl std::error::Error for UniformError {}
 
 impl Uniform {
diff --git a/src/distribution/weibull.rs b/src/distribution/weibull.rs
index f30f5259..447a8139 100644
--- a/src/distribution/weibull.rs
+++ b/src/distribution/weibull.rs
@@ -47,6 +47,7 @@ impl core::fmt::Display for WeibullError {
     }
 }
 
+#[cfg(feature = "std")]
 impl std::error::Error for WeibullError {}
 
 impl Weibull {
diff --git a/src/function/beta.rs b/src/function/beta.rs
index 98ff74c4..b67b8033 100644
--- a/src/function/beta.rs
+++ b/src/function/beta.rs
@@ -30,6 +30,7 @@ impl core::fmt::Display for BetaFuncError {
     }
 }
 
+#[cfg(feature = "std")]
 impl std::error::Error for BetaFuncError {}
 
 /// Computes the natural logarithm
diff --git a/src/function/gamma.rs b/src/function/gamma.rs
index 7d90112c..cbb59b35 100644
--- a/src/function/gamma.rs
+++ b/src/function/gamma.rs
@@ -26,6 +26,7 @@ impl core::fmt::Display for GammaFuncError {
     }
 }
 
+#[cfg(feature = "std")]
 impl std::error::Error for GammaFuncError {}
 
 /// Auxiliary variable when evaluating the `gamma_ln` function
diff --git a/src/stats_tests/fisher.rs b/src/stats_tests/fisher.rs
index 39747885..3f8ab8e8 100644
--- a/src/stats_tests/fisher.rs
+++ b/src/stats_tests/fisher.rs
@@ -117,6 +117,7 @@ impl core::fmt::Display for FishersExactTestError {
     }
 }
 
+#[cfg(feature = "std")]
 impl std::error::Error for FishersExactTestError {}
 
 impl From<HypergeometricError> for FishersExactTestError {