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How to go back to previous opened file in Vim? [duplicate]

I can use gf to go to the file with name under/after cursor, is there any command to go back to the original file without relaunch vim to open it? ...
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Transitivity of Auto-Specialization in GHC

...e question's key points, as I understand them, are the following: "is the auto-specialization transitive?" Should I only expect (+) to be specialized transitively with an explicit pragma? (apparently intended) Is this a bug of GHC? Is it inconsistent with the documentation? AFAIK, t...
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Efficient SQL test query or validation query that will work across all (or most) databases

...psky) PostgreSQL SQLite SELECT 1 FROM DUAL Oracle SELECT 1 FROM any_existing_table WHERE 1=0 or SELECT 1 FROM INFORMATION_SCHEMA.SYSTEM_USERS or CALL NOW() HSQLDB (tested with version 1.8.0.10) Note: I tried using a WHERE 1=0 clause on the second query, but it didn't work as a value for Apach...
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Databinding an enum property to a ComboBox in WPF

... ItemsSource="{Binding Source={my:Enumeration {x:Type my:Status}}}" DisplayMemberPath="Description" SelectedValue="{Binding CurrentStatus}" SelectedValuePath="Value" /> And the implementation... public class EnumerationExtension : MarkupExtension { private Type _enumTy...
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Why doesn't Objective-C support private methods?

...seem to be a way to make a truly private method. I accept that. But, why is this so? Every explanation I've essentially says, "you can't do it, but here's a close approximation." ...
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How to get number of rows using SqlDataReader in C#

My question is how to get the number of rows returned by a query using SqlDataReader in C#. I've seen some answers about this but none were clearly defined except for one that states to do a while loop with Read() method and increment a counter. ...
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How do I install PyCrypto on Windows?

... If you don't already have a C/C++ development environment installed that is compatible with the Visual Studio binaries distributed by Python.org, then you should stick to installing only pure Python packages or packages for which a Windows binary is available. Fortunately, there are PyCrypto bina...
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Case insensitive comparison of strings in shell script

The == operator is used to compare two strings in shell script. However, I want to compare two strings ignoring case, how can it be done? Is there any standard command for this? ...
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How do I assert an Iterable contains elements with a certain property?

Assume I want to unit test a method with this signature: 7 Answers 7 ...
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Is there something like Annotation Inheritance in java?

...read the annotations on a class without loading them all the way. See Why is it not possible to extend annotations in Java? However, types do inherit the annotations of their superclass if those annotations are @Inherited. Also, unless you need those methods to interact, you could just stack the ...