Implicit Self: bare field names inside methods (e.g. FPos := FPos + 1)
now work without explicit Self. prefix. TIdentExpr.IsImplicitSelf /
ImplicitFieldInfo flags set by AnalyseExpr when lookup fails but a class
field matches; TAssignment.ImplicitSelfField set by AnalyseAssignment.
Codegen emits loadl %_var_Self + offset for reads, storew/storel through
Self + offset for writes. Required for migrating the compiler source which
was written in FPC style without explicit Self.
OrdAt(s, i): integer RTL function — returns ASCII ordinal of character at
1-based position i. Replaces FSource[FPos] (array indexing) in the
migrated uPasTokeniser.
Migration script (tests/blaise-compiler.pas): initial work-in-progress
self-hosting source. Script handles: const→class body stripping, inline
qualifier removal, inline-var removal, Exit(expr) expansion, shr/shl
conversion, constructor/destructor→procedure, access modifier stripping,
keyword array → TStringList/InitKeywords, FSource[expr] → OrdAt(FSource, expr),
char-range in [...] → integer comparisons, repeat...until → while True.
834 tests pass.