feat(diagnostics): print source diagnostics in gcc file:line: layout

Lexer, parser, driver and codegen diagnostics now read
"<path>:<line>: error: <message>" instead of "error: <message> at line N
in <path>". The path is always printed as given on the command line.
Call sites pass the bare message to cps::sourceError/sourceWarning, which
carry printf format checking; reportError routes through the same helper.

The suite iii harness parses the new layout and matches the reason
against the message only. iii/template-class-pack-field passed only
because its reason regex matched the case path, so it is now
case-insensitive.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 7 insertions, 8 deletions

diff --git a/lib/Parser/ParserFile.cc b/lib/Parser/ParserFile.cc
index 99a939f..c51c7e7 100644
--- a/lib/Parser/ParserFile.cc
+++ b/lib/Parser/ParserFile.cc
@@ -14,7 +14,7 @@ std::unique_ptr<StmtAST> Parser::ParseOpenFile() {
     if (!FileName) return nullptr;
 
     if (CurTok != tok_for) {
-        cps::sourceDiagnostic(Lex.getLine(), "error: Expected FOR after OPENFILE filename at line %d\n", Lex.getLine());
+        cps::sourceError(Lex.getLine(), "Expected FOR after OPENFILE filename");
         return nullptr;
     }
     getNextToken(); // eat FOR
@@ -25,11 +25,10 @@ std::unique_ptr<StmtAST> Parser::ParseOpenFile() {
     case tok_write:  Mode = FileMode::Write;  break;
     case tok_append: Mode = FileMode::Append; break;
     case tok_random:
-        cps::sourceDiagnostic(Lex.getLine(), "error: File mode RANDOM is not implemented (text files only) at line %d\n",
-                Lex.getLine());
+        cps::sourceError(Lex.getLine(), "File mode RANDOM is not implemented (text files only)");
         return nullptr;
     default:
-        cps::sourceDiagnostic(Lex.getLine(), "error: Expected file mode READ, WRITE or APPEND at line %d\n", Lex.getLine());
+        cps::sourceError(Lex.getLine(), "Expected file mode READ, WRITE or APPEND");
         return nullptr;
     }
     getNextToken(); // eat the mode keyword
@@ -46,13 +45,13 @@ std::unique_ptr<StmtAST> Parser::ParseReadFile() {
     if (!FileName) return nullptr;
 
     if (CurTok != ',') {
-        cps::sourceDiagnostic(Lex.getLine(), "error: Expected ',' after READFILE filename at line %d\n", Lex.getLine());
+        cps::sourceError(Lex.getLine(), "Expected ',' after READFILE filename");
         return nullptr;
     }
     getNextToken(); // eat ','
 
     if (CurTok != tok_identifier) {
-        cps::sourceDiagnostic(Lex.getLine(), "error: Expected variable name after ',' in READFILE at line %d\n", Lex.getLine());
+        cps::sourceError(Lex.getLine(), "Expected variable name after ',' in READFILE");
         return nullptr;
     }
     std::string VarName = Lex.IdentifierStr;
@@ -62,7 +61,7 @@ std::unique_ptr<StmtAST> Parser::ParseReadFile() {
         // Consume the whole designator so it cannot replay as statements.
         std::vector<DesignatorAccess> Dummy;
         ParseDesignatorSuffix(Dummy);
-        cps::sourceDiagnostic(Lex.getLine(), "error: READFILE target must be a plain STRING variable at line %d\n", Line);
+        cps::sourceError(Line, "READFILE target must be a plain STRING variable");
         return nullptr;
     }
 
@@ -78,7 +77,7 @@ std::unique_ptr<StmtAST> Parser::ParseWriteFile() {
     if (!FileName) return nullptr;
 
     if (CurTok != ',') {
-        cps::sourceDiagnostic(Lex.getLine(), "error: Expected ',' after WRITEFILE filename at line %d\n", Lex.getLine());
+        cps::sourceError(Lex.getLine(), "Expected ',' after WRITEFILE filename");
         return nullptr;
     }
     getNextToken(); // eat ','