Merge #307

307: Use build.rs for conditional compilation r=korken89 a=AfoHT

Extend the current test suite to allow for running tests on newer rustc-versions than current MSRV.

Required by #306 to add special tests for future MSRV.

To exclude an example from the regular non-nightly testing:

```
#![no_main]
#![no_std]

#[cfg(rustc_is_nightly)]
mod example {

    use panic_halt as _;

    #[rtfm::app(device = lm3s6965)]
    const APP: () = {
    <more code>
    }
}
```

Co-authored-by: Henrik Tjäder <henrik@tjaders.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/ci/script.sh b/ci/script.sh
index 78341e1..7b86e52 100644
--- a/ci/script.sh
+++ b/ci/script.sh
@@ -44,6 +44,13 @@ main() {
         fi
 
         if [ $TRAVIS_RUST_VERSION = nightly ]; then
+            # Tests where required MSRV > 1.36
+            #local exs=(
+            #)
+            #for ex in ${exs[@]}; do
+            #    cargo check --example $ex --target $T
+            #done
+
             # multi-core compile-pass tests
             pushd heterogeneous
             local exs=(