Steps 5 and 6 of v0.3.0 multi-file self-hosting:
- rtl/src/main/pascal/sysutils.pas: Exception base class with
Create(AMessage: string) constructor and Message property.
- rtl/src/main/pascal/strutils.pas: empty stub unit satisfying
the unit loader for `uses StrUtils` without any API calls.
To parse these RTL units, the compiler now recognises `constructor`
and `destructor` as reserved keywords (uLexer.pas, uParser.pas),
treating both as aliases for `procedure` in method declarations.
The constructor nature of a call is determined at the call site, not
from the declaration keyword — matching the existing codegen model.
Tests (cp.test.exceptions.pas):
- TestSemantic_ExceptionSubclass_CreateAndMessage_OK
- TestCodegen_ExceptionSubclass_CtorCallWithMessage
Hand source (tests/blaise-compiler.pas) synced with all changes.
Fixpoint verified (stage-2 IR == stage-3 IR).
docs/language-rationale.adoc: Constructor/Destructor Keywords section.
docs/grammar.ebnf: CONSTRUCTOR/DESTRUCTOR terminals; MethodDecl updated.
docs/future-improvements.adoc: Stream I/O, macOS debugging, and
multi-line string literals sections (cleaned up from draft notes).
2f7f551925