fix #27959, regression in location info inside macro expansions

src/julia-syntax.scm

@@ -4078,7 +4078,8 @@ f(x) = yt(x)
             (cond ((and (pair? e) (eq? (car e) 'line))
                    (if (and (= current-line 0) (length= e 2) (pair? linetable))
                        ;; (line n) after push_loc just updates the line for the new file
-                       (set-car! (cdr (car linetable)) (cadr e))
+                       (begin (set-car! (cdr (car linetable)) (cadr e))
+                              (set! current-line (cadr e)))
                        (begin
                          (set! current-line (cadr e))
                          (if (pair? (cddr e))

test/backtrace.jl

@@ -164,3 +164,16 @@ let st = stacktrace(bt23971)
     @test string(st[1].file) == @__FILE__
     @test !occursin("missing", string(st[2].file))
 end
+
+# issue #27959
+let bt, found = false
+    @testset begin
+        bt = backtrace()
+    end
+    for frame in map(StackTraces.lookup, bt)
+        if frame[1].line == @__LINE__() - 3 && frame[1].file == Symbol(@__FILE__)
+            found = true; break
+        end
+    end
+    @test found
+end