Add CI for Rust 1.39.0

Author: kngwyu

.travis.yml

@@ -6,18 +6,21 @@ cache:
   pip: true
   cargo: true
 
-matrix:
+env:
+  global:
+    - TRAVIS_RUST_VERSION=stable
+    - RUST_BACKTRACE=1
+
+jobs:
   include:
     - python: "3.5"
     - python: "3.6"
     - python: "3.7"
     - python: "3.8"
       env: RUN_LINT=1
-
-env:
-  global:
-    - TRAVIS_RUST_VERSION=stable
-    - RUST_BACKTRACE=1
+    - name: MSRV
+      python: "3.8"
+      env: TRAVIS_RUST_VERSTION=1.39.0
 
 addons:
   apt:

Cargo.toml

@@ -15,7 +15,7 @@ libc = "0.2"
 num-complex = "0.2"
 num-traits = "0.2"
 ndarray = ">=0.13"
-pyo3 = "0.12"
+pyo3 = ">=0.12"
 
 [features]
 # In default setting, python version is automatically detected

src/npyiter.rs

@@ -436,7 +436,7 @@ impl<'py, T: Element, S: MultiIterModeWithManyArrays> NpyMultiIterBuilder<'py, T
             was_writables,
             ..
         } = self;
-        debug_assert!(arrays.len() <= i32::MAX as usize);
+        debug_assert!(arrays.len() <= std::i32::MAX as usize);
         debug_assert!(2 <= arrays.len());
 
         let mut opflags = S::flags();