CI: more accurate no-default-feature and nightly test targets

Also more accurate flags in examples

.github/workflows/test.yml

@@ -73,14 +73,15 @@ jobs:
       - name: Maybe nightly
         if: ${{ matrix.toolchain == 'nightly' }}
         run: |
-          cargo test --target ${{ matrix.target }} --tests --features=nightly
+          cargo test --target ${{ matrix.target }} --features=nightly
           cargo test --target ${{ matrix.target }} --all-features
           cargo test --target ${{ matrix.target }} --benches --features=nightly
           cargo test --target ${{ matrix.target }} --manifest-path rand_distr/Cargo.toml --benches
       - name: Test rand
         run: |
-          cargo test --target ${{ matrix.target }} --tests --no-default-features
-          cargo test --target ${{ matrix.target }} --tests --no-default-features --features=alloc,getrandom,small_rng
+          cargo test --target ${{ matrix.target }} --lib --tests --no-default-features
+          cargo build --target ${{ matrix.target }} --no-default-features --features alloc,getrandom,small_rng
+          cargo test --target ${{ matrix.target }} --lib --tests --no-default-features --features=alloc,getrandom,small_rng
           # all stable features:
           cargo test --target ${{ matrix.target }} --features=serde1,log,small_rng
           cargo test --target ${{ matrix.target }} --examples

examples/monte-carlo.rs

@@ -24,7 +24,7 @@
 //! the square at random, calculate the fraction that fall within the circle,
 //! and multiply this fraction by 4.
 
-#![cfg(feature = "std")]
+#![cfg(all(feature = "std", feature = "std_rng"))]
 
 use rand::distributions::{Distribution, Uniform};
 

examples/monty-hall.rs

@@ -26,7 +26,7 @@
 //!
 //! [Monty Hall Problem]: https://en.wikipedia.org/wiki/Monty_Hall_problem
 
-#![cfg(feature = "std")]
+#![cfg(all(feature = "std", feature = "std_rng"))]
 
 use rand::distributions::{Distribution, Uniform};
 use rand::Rng;