1483 - *really* check color screens in scenarios

Required fixing two levels of bugs:

a) The hack in tangle to drop initial comments a '%' directive..

b) ..was masking a bug where run_mu_scenario wasn't robust to initial
comments.

Mildly concerned that neither of the sub-issues have their own tests,
but I'm just removing hacks, and writing tests for that throwaway
function like run_mu_scenario seems pointless. Instead I've solved the
problem by disallowing comments before '%' directives.

I've also taken this opportunity to at least try to document the
'scenarios' and '%' directives at the first layer where they appear.

1 files changed, 1 insertions, 1 deletions

diff --git a/011load.cc b/011load.cc
index 8cbffbe7..b779aa9e 100644
--- a/011load.cc
+++ b/011load.cc
@@ -1,6 +1,6 @@
 //: Phase 1 of running mu code: load it from a textual representation.
 
-:(scenarios load)
+:(scenarios load)  // use 'load' instead of 'run' in all scenarios in this layer
 :(scenario first_recipe)
 recipe main [
   1:number <- copy 23:literal