Add run-pass tests for SpanlessEq/SpanlessHash ICE

Author: phansch

tests/run-pass/ice-1782.rs

@@ -0,0 +1,17 @@
+#![allow(dead_code, unused_variables)]
+
+/// Should not trigger an ICE in `SpanlessEq` / `consts::constant`
+///
+/// Issue: https://github.com/rust-lang-nursery/rust-clippy/issues/1782
+
+use std::{mem, ptr};
+
+fn spanless_eq_ice() {
+    let txt = "something";
+    match txt {
+        "something" => unsafe { ptr::write(ptr::null_mut() as *mut u32, mem::transmute::<[u8; 4], _>([0, 0, 0, 255])) },
+        _ => unsafe { ptr::write(ptr::null_mut() as *mut u32, mem::transmute::<[u8; 4], _>([13, 246, 24, 255])) },
+    }
+}
+
+fn main() {}

tests/run-pass/ice-2499.rs

@@ -0,0 +1,24 @@
+#![allow(dead_code)]
+
+/// Should not trigger an ICE in `SpanlessHash` / `consts::constant`
+///
+/// Issue: https://github.com/rust-lang-nursery/rust-clippy/issues/2499
+
+fn f(s: &[u8]) -> bool {
+    let t = s[0] as char;
+
+    match t {
+        'E' | 'W' => {}
+        'T' => if &s[0..(0 + 4)] != &['0' as u8; 4] {
+            return false;
+        } else {
+            return true;
+        },
+        _ => {
+            return false;
+        }
+    }
+    true
+}
+
+fn main() {}

tests/run-pass/ice-2594.rs

@@ -0,0 +1,20 @@
+#![allow(dead_code, unused_variables)]
+
+/// Should not trigger an ICE in `SpanlessHash` / `consts::constant`
+///
+/// Issue: https://github.com/rust-lang-nursery/rust-clippy/issues/2594
+
+fn spanless_hash_ice() {
+    let txt = "something";
+    let empty_header: [u8; 1] = [1; 1];
+
+    match txt {
+        "something" => {
+            let mut headers = [empty_header; 1];
+        }
+        "" => (),
+        _ => (),
+    }
+}
+
+fn main() {}