build_environment: drop off by one fix (spack#47960)

Author: haampie

lib/spack/spack/build_environment.py

@@ -1426,27 +1426,20 @@ def make_stack(tb, stack=None):
     # We found obj, the Package implementation we care about.
     # Point out the location in the install method where we failed.
     filename = inspect.getfile(frame.f_code)
-    lineno = frame.f_lineno
-    if os.path.basename(filename) == "package.py":
-        # subtract 1 because we inject a magic import at the top of package files.
-        # TODO: get rid of the magic import.
-        lineno -= 1
-
-    lines = ["{0}:{1:d}, in {2}:".format(filename, lineno, frame.f_code.co_name)]
+    lines = [f"{filename}:{frame.f_lineno}, in {frame.f_code.co_name}:"]
 
     # Build a message showing context in the install method.
     sourcelines, start = inspect.getsourcelines(frame)
 
     # Calculate lineno of the error relative to the start of the function.
-    fun_lineno = lineno - start
+    fun_lineno = frame.f_lineno - start
     start_ctx = max(0, fun_lineno - context)
     sourcelines = sourcelines[start_ctx : fun_lineno + context + 1]
 
     for i, line in enumerate(sourcelines):
         is_error = start_ctx + i == fun_lineno
-        mark = ">> " if is_error else "   "
         # Add start to get lineno relative to start of file, not function.
-        marked = "  {0}{1:-6d}{2}".format(mark, start + start_ctx + i, line.rstrip())
+        marked = f"  {'>> ' if is_error else '   '}{start + start_ctx + i:-6d}{line.rstrip()}"
         if is_error:
             marked = colorize("@R{%s}" % cescape(marked))
         lines.append(marked)