Working idris2 error detection

Idris 2 doesn't have a failing exit code in this context when it fails
to compile an expr given at the command line, we need to check for an
error message in the output

examples/testy/test/src/TestModule/Booleans.idr

@@ -1,9 +1,11 @@
 module TestModule.Booleans
 
+import System
+
 -- @@test Boolean Integration passes
-passes : IO Bool
-passes = pure True
+doesWork : IO Bool
+doesWork = pure True
 
 -- @@test Boolean Integration fails
-fails : IO Bool
-fails = pure False
+dontWork : IO Bool
+dontWork = pure False

lib/IUtils/Compiler.rakumod

@@ -51,6 +51,8 @@ class IdrisError is Exception {
         qq:to/END/;
         Error running idris command: $.command
         Command exited with $.exit-code
+        StdOut:
+        {$.out.lines.map(*.indent: 2).join("\n")}
         END
     }
 }
@@ -75,7 +77,7 @@ sub idris-run(*@cmd) is export {
     my $proc = run "idris2",  @cmd, :out, :err;
     my $out = $proc.out.slurp(:close);
     my $err = $proc.err.slurp(:close);
-    unless $proc {
+    if !$proc || $out.contains("Error:") {
         IdrisError.new(
             out => $out, err => $err,
             exit-code => $proc.exitcode, command => @cmd.Str)
@@ -117,5 +119,7 @@ sub idris-exec($expr, $file, $output-type? = Unit) is export {
             exit-code => $proc.exitcode, expr => $expr
         ).throw;
     }
+    # Remove the output file
+    'build/exec/iutils_out'.IO.unlink;
     return $out;
 }