Wrong offset with IndentationError ("expected an indented block")

[blueyed]

BPO	31495
Nosy	@blueyed, @vadmium, @csabella

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2019-03-22.00:00:42.162>
created_at = <Date 2017-09-16.20:58:29.614>
labels = ['interpreter-core', 'type-bug', '3.8']
title = 'Wrong offset with IndentationError ("expected an indented block")'
updated_at = <Date 2019-03-22.00:00:42.160>
user = 'https://github.com/blueyed'

bugs.python.org fields:

activity = <Date 2019-03-22.00:00:42.160>
actor = 'cheryl.sabella'
assignee = 'none'
closed = True
closed_date = <Date 2019-03-22.00:00:42.162>
closer = 'cheryl.sabella'
components = ['Interpreter Core']
creation = <Date 2017-09-16.20:58:29.614>
creator = 'blueyed'
dependencies = []
files = []
hgrepos = []
issue_num = 31495
keywords = []
message_count = 3.0
messages = ['302354', '302356', '338574']
nosy_count = 3.0
nosy_names = ['blueyed', 'martin.panter', 'cheryl.sabella']
pr_nums = []
priority = 'normal'
resolution = 'works for me'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue31495'
versions = ['Python 3.8']

[blueyed]

Given the following file t-expected-indent.py:

if 1:
foo

python t-expected-indent.py reports:

  File "t-expected-indent.py", line 2
    foo
      ^
IndentationError: expected an indented block

However, it should get reported for column 1 instead of 3.

[vadmium]

Some relevant info I wrote in bpo-25677:

‘The caret points to the character _before_ offset. . . . In some cases (e.g. the line “1 +”), the offset is the string index _after_ the error. But in the case of “1;1 + 1 = 2”, offset is the index where the error (statement) begins.’

In this case it looks like the offset is of the end of the first word on the line that has the wrong indentation. The caret is positioned one position back, to point at the last character of that word.

[csabella]

I've retested this under 3.8 and the caret is now positioned at the first character in the line, therefore I'm closing this issue as resolved.