Merge pull request swiftlang#40836 from angela-laar/smooth_operator

[Parser] Check for postfix operator in import paths

Author: angela-laar

include/swift/AST/DiagnosticsParse.def

@@ -315,6 +315,8 @@ ERROR(decl_expected_module_name,none,
 ERROR(expected_module_alias,none,
       "cannot refer to module as %0 because it has been aliased; use %1 "
       "instead", (Identifier, Identifier))
+ERROR(unexpected_operator_in_import_path,none,
+      "cannot include postfix operator in import declaration",())
 
 // Extension
 ERROR(expected_lbrace_extension,PointsToFirstBadToken,

lib/Parse/ParseDecl.cpp

@@ -4873,6 +4873,11 @@ ParserResult<ImportDecl> Parser::parseDeclImport(ParseDeclOptions Flags,
                            /*diagnoseDollarPrefix=*/false,
                            diag::expected_identifier_in_decl, "import"))
       return nullptr;
+    if (Tok.is(tok::oper_postfix)) {
+        diagnose(Tok, diag::unexpected_operator_in_import_path)
+          .fixItRemove(Tok.getLoc());
+        return nullptr;
+    }
     HasNext = consumeIf(tok::period);
   } while (HasNext);
 

test/decl/import/import.swift

@@ -49,6 +49,7 @@ import func Swift.min
 
 import var x // expected-error {{expected module name}}
 import struct Swift.nonexistent // expected-error {{struct 'nonexistent' does not exist in module 'Swift'}}
+import func SwiftUI.Text.++ // expected-error{{cannot include postfix operator in import declaration}}{{25-28=}}
 
 import Swift.import.abc // expected-error {{expected identifier in import declaration}}
 // expected-error @-1 {{keyword 'import' cannot be used as an identifier here}}