fixed some newly introduced bugs

doc/grammar.txt

@@ -96,7 +96,8 @@ simpleStmt ::= returnStmt
 complexStmt ::= ifStmt | whileStmt | caseStmt | tryStmt | forStmt
               | blockStmt | asmStmt
               | procDecl | iteratorDecl | macroDecl | templateDecl | methodDecl
-              | constSection | typeSection | whenStmt | varSection
+              | constSection | letSection | varSection
+              | typeSection | whenStmt
 
 indPush ::= IND # and push indentation onto the stack
 indPop ::= # pop indentation from the stack
@@ -157,6 +158,8 @@ colonAndEquals ::= [':' typeDesc] '=' expr
 constDecl ::= symbol ['*'] [pragma] colonAndEquals [COMMENT | IND COMMENT]
             | COMMENT
 constSection ::= 'const' indPush constDecl (SAD constDecl)* DED indPop
+letSection ::= 'let' indPush constDecl (SAD constDecl)* DED indPop
+
 typeDef ::= typeDesc | objectDef | enumDef | 'distinct' typeDesc
 
 objectField ::= symbol ['*'] [pragma]

doc/manual.txt

@@ -442,6 +442,11 @@ The rules for compile-time computability are:
    computable arguments.
 
 
+Constants cannot be of type ``var`` or ``object``, nor can 
+they contain such a type. For the types ``ptr`` and ``ref`` only the
+constant literal ``nil`` is possible.
+
+
 Types
 -----