diff --git a/src/plugins/bineditor/bineditorplugin.cpp b/src/plugins/bineditor/bineditorplugin.cpp
index 008f568de9d..d5ea0068e63 100644
--- a/src/plugins/bineditor/bineditorplugin.cpp
+++ b/src/plugins/bineditor/bineditorplugin.cpp
@@ -90,7 +90,7 @@ public:
     void setSizes(quint64 startAddr, qint64 range, int blockSize = 4096);
 
     QByteArray contents() const final { return dataMid(0, m_size); }
-    bool setContents(const QByteArray &contents) final;
+    Utils::Result<> setContents(const QByteArray &contents) final;
 
     ReloadBehavior reloadBehavior(ChangeTrigger state, ChangeType type) const final
     {
@@ -2107,14 +2107,14 @@ BinEditorDocument::BinEditorDocument()
     m_newRangeRequestHandler = [this](quint64 offset) { provideNewRange(offset); };
 }
 
-bool BinEditorDocument::setContents(const QByteArray &contents)
+Result<> BinEditorDocument::setContents(const QByteArray &contents)
 {
     clear();
     if (!contents.isEmpty()) {
         setSizes(0, contents.length(), contents.length());
         addData(0, contents);
     }
-    return true;
+    return ResultOk;
 }
 
 Result<> BinEditorDocument::openImpl(const FilePath &filePath, quint64 offset)
diff --git a/src/plugins/compilerexplorer/compilerexplorereditor.cpp b/src/plugins/compilerexplorer/compilerexplorereditor.cpp
index a5e9a483678..d3896fb2ae3 100644
--- a/src/plugins/compilerexplorer/compilerexplorereditor.cpp
+++ b/src/plugins/compilerexplorer/compilerexplorereditor.cpp
@@ -156,7 +156,7 @@ public:
 
     Result<> saveImpl(const Utils::FilePath &filePath, bool autoSave) override;
 
-    bool setContents(const QByteArray &contents) override;
+    Result<> setContents(const QByteArray &contents) override;
 
     QString fallbackSaveAsFileName() const override;
 
@@ -418,7 +418,7 @@ Result<> JsonSettingsDocument::saveImpl(const FilePath &newFilePath, bool autoSa
         m_ceSettings.toMap(store);
     }
 
-    Utils::FilePath path = newFilePath.isEmpty() ? filePath() : newFilePath;
+    FilePath path = newFilePath.isEmpty() ? filePath() : newFilePath;
 
     if (!newFilePath.isEmpty() && !autoSave) {
         setPreferredDisplayName({});
@@ -438,17 +438,17 @@ bool JsonSettingsDocument::isModified() const
     return m_ceSettings.isDirty();
 }
 
-bool JsonSettingsDocument::setContents(const QByteArray &contents)
+Result<> JsonSettingsDocument::setContents(const QByteArray &contents)
 {
-    auto result = storeFromJson(contents);
-    QTC_ASSERT_RESULT(result, return false);
+    Result<Store> result = storeFromJson(contents);
+    QTC_ASSERT_RESULT(result, return ResultError(result.error()));
 
-    m_ceSettings.fromMap(*result);
+    m_ceSettings.fromMap(result.value());
 
     emit settingsChanged();
     emit changed();
     emit contentsChanged();
-    return true;
+    return ResultOk;
 }
 
 QString JsonSettingsDocument::fallbackSaveAsFileName() const
diff --git a/src/plugins/coreplugin/idocument.cpp b/src/plugins/coreplugin/idocument.cpp
index 7e01baceda9..3d05ab25a7c 100644
--- a/src/plugins/coreplugin/idocument.cpp
+++ b/src/plugins/coreplugin/idocument.cpp
@@ -70,21 +70,6 @@
     \ingroup mainclasses
 */
 
-/*!
-    \enum Core::Utils::Result<>
-
-    The OpenResult enum describes whether a file was successfully opened.
-
-    \value Success
-           The file was read successfully and can be handled by this document
-           type.
-    \value ReadError
-           The file could not be opened for reading, either because it does not
-           exist or because of missing permissions.
-    \value CannotHandle
-           This document type could not handle the file content.
-*/
-
 /*!
     \enum Core::IDocument::ReloadSetting
 
@@ -391,10 +376,10 @@ QByteArray IDocument::contents() const
     \sa contents()
     \sa EditorManager::openEditorWithContents()
 */
-bool IDocument::setContents(const QByteArray &contents)
+Result<> IDocument::setContents(const QByteArray &contents)
 {
     Q_UNUSED(contents)
-    return false;
+    return ResultError(ResultUnimplemented);
 }
 
 /*!
diff --git a/src/plugins/coreplugin/idocument.h b/src/plugins/coreplugin/idocument.h
index a8a780c8192..b2c27af5476 100644
--- a/src/plugins/coreplugin/idocument.h
+++ b/src/plugins/coreplugin/idocument.h
@@ -65,7 +65,7 @@ public:
     Utils::Result<> save(const Utils::FilePath &filePath = {}, bool autoSave = false);
 
     virtual QByteArray contents() const;
-    virtual bool setContents(const QByteArray &contents);
+    virtual Utils::Result<> setContents(const QByteArray &contents);
     virtual void formatContents();
 
     const Utils::FilePath &filePath() const;
diff --git a/src/plugins/designer/formwindowfile.cpp b/src/plugins/designer/formwindowfile.cpp
index 2b455542cc3..20e47bd758e 100644
--- a/src/plugins/designer/formwindowfile.cpp
+++ b/src/plugins/designer/formwindowfile.cpp
@@ -114,17 +114,17 @@ QByteArray FormWindowFile::contents() const
     return formWindowContents().toUtf8();
 }
 
-bool FormWindowFile::setContents(const QByteArray &contents)
+Result<> FormWindowFile::setContents(const QByteArray &contents)
 {
     if (Designer::Constants::Internal::debug)
         qDebug() << Q_FUNC_INFO << contents.size();
 
     document()->clear();
 
-    QTC_ASSERT(m_formWindow, return false);
+    QTC_ASSERT(m_formWindow, return ResultError(ResultAssert));
 
     if (contents.isEmpty())
-        return false;
+        return ResultError(ResultAssert);
 
     // If we have an override cursor, reset it over Designer loading,
     // should it pop up messages about missing resources or such.
@@ -141,11 +141,11 @@ bool FormWindowFile::setContents(const QByteArray &contents)
         QApplication::setOverrideCursor(overrideCursor);
 
     if (!success)
-        return false;
+        return ResultError(ResultAssert);
 
     syncXmlFromFormWindow();
     setShouldAutoSave(false);
-    return true;
+    return ResultOk;
 }
 
 void FormWindowFile::setFilePath(const FilePath &newName)
diff --git a/src/plugins/designer/formwindowfile.h b/src/plugins/designer/formwindowfile.h
index 444676cb954..e244bf4c0e9 100644
--- a/src/plugins/designer/formwindowfile.h
+++ b/src/plugins/designer/formwindowfile.h
@@ -29,7 +29,7 @@ public:
     Utils::Result<> open(const Utils::FilePath &filePath,
                          const Utils::FilePath &realFilePath) override;
     QByteArray contents() const override;
-    bool setContents(const QByteArray &contents) override;
+    Utils::Result<> setContents(const QByteArray &contents) override;
     bool shouldAutoSave() const override;
     bool isModified() const override;
     bool isSaveAsAllowed() const override;
diff --git a/src/plugins/diffeditor/diffeditordocument.cpp b/src/plugins/diffeditor/diffeditordocument.cpp
index bbb5ec1eee4..baf98cdbf74 100644
--- a/src/plugins/diffeditor/diffeditordocument.cpp
+++ b/src/plugins/diffeditor/diffeditordocument.cpp
@@ -208,10 +208,10 @@ bool DiffEditorDocument::ignoreWhitespace() const
     return m_ignoreWhitespace;
 }
 
-bool DiffEditorDocument::setContents(const QByteArray &contents)
+Result<> DiffEditorDocument::setContents(const QByteArray &contents)
 {
     Q_UNUSED(contents)
-    return true;
+    return ResultOk;
 }
 
 FilePath DiffEditorDocument::fallbackSaveAsPath() const
diff --git a/src/plugins/diffeditor/diffeditordocument.h b/src/plugins/diffeditor/diffeditordocument.h
index 1157993d01f..5eec8c940aa 100644
--- a/src/plugins/diffeditor/diffeditordocument.h
+++ b/src/plugins/diffeditor/diffeditordocument.h
@@ -55,7 +55,7 @@ public:
     void setIgnoreWhitespace(bool ignore);
     bool ignoreWhitespace() const;
 
-    bool setContents(const QByteArray &contents) override;
+    Utils::Result<> setContents(const QByteArray &contents) override;
     Utils::FilePath fallbackSaveAsPath() const override;
     QString fallbackSaveAsFileName() const override;
 
diff --git a/src/plugins/perforce/perforcesubmiteditor.cpp b/src/plugins/perforce/perforcesubmiteditor.cpp
index e066cb367e6..7e999fd384d 100644
--- a/src/plugins/perforce/perforcesubmiteditor.cpp
+++ b/src/plugins/perforce/perforcesubmiteditor.cpp
@@ -11,6 +11,8 @@
 
 #include <QRegularExpression>
 
+using namespace Utils;
+
 namespace Perforce::Internal {
 
 enum { FileSpecRole = Qt::UserRole + 1 };
@@ -38,12 +40,12 @@ QByteArray PerforceSubmitEditor::fileContents() const
     return text.toLocal8Bit();
 }
 
-bool PerforceSubmitEditor::setFileContents(const QByteArray &contents)
+Result<> PerforceSubmitEditor::setFileContents(const QByteArray &contents)
 {
     if (!parseText(QString::fromUtf8(contents)))
-        return false;
+        return ResultError(ResultAssert); // FIXME: parseText always returns true, why?
     updateFields();
-    return true;
+    return ResultOk;
 }
 
 bool PerforceSubmitEditor::parseText(QString text)
diff --git a/src/plugins/perforce/perforcesubmiteditor.h b/src/plugins/perforce/perforcesubmiteditor.h
index d3098df0531..3745c4e34a9 100644
--- a/src/plugins/perforce/perforcesubmiteditor.h
+++ b/src/plugins/perforce/perforcesubmiteditor.h
@@ -37,7 +37,7 @@ public:
 
 protected:
     QByteArray fileContents() const override;
-    bool setFileContents(const QByteArray &contents) override;
+    Utils::Result<> setFileContents(const QByteArray &contents) override;
 
 private:
     inline PerforceSubmitEditorWidget *submitEditorWidget();
diff --git a/src/plugins/resourceeditor/resourceeditor.cpp b/src/plugins/resourceeditor/resourceeditor.cpp
index 2126c030f23..8d65b196ce5 100644
--- a/src/plugins/resourceeditor/resourceeditor.cpp
+++ b/src/plugins/resourceeditor/resourceeditor.cpp
@@ -51,7 +51,7 @@ public:
     Result<> open(const FilePath &filePath, const FilePath &realFilePath) final;
     QString plainText() const { return m_model.contents(); }
     QByteArray contents() const final { return m_model.contents().toUtf8(); }
-    bool setContents(const QByteArray &contents) final;
+    Result<> setContents(const QByteArray &contents) final;
     bool shouldAutoSave() const final { return m_shouldAutoSave; }
     bool isModified() const final { return m_model.dirty(); }
     bool isSaveAsAllowed() const final { return true; }
@@ -236,22 +236,23 @@ Result<> ResourceEditorDocument::saveImpl(const FilePath &filePath, bool autoSav
     return ResultOk;
 }
 
-bool ResourceEditorDocument::setContents(const QByteArray &contents)
+Result<> ResourceEditorDocument::setContents(const QByteArray &contents)
 {
     TempFileSaver saver;
     saver.write(contents);
     if (!saver.finalize(ICore::dialogParent()))
-        return false;
+        return ResultError(saver.errorString());
 
     const FilePath originalFileName = m_model.filePath();
     m_model.setFilePath(saver.filePath());
-    const bool success = (m_model.reload().has_value());
+    const Result<> result = m_model.reload();
+    const bool success = result.has_value();
     m_model.setFilePath(originalFileName);
     m_shouldAutoSave = false;
     if (debugResourceEditorW)
         qDebug() <<  "ResourceEditorW::createNew: " << contents << " (" << saver.filePath() << ") returns " << success;
     emit loaded(success);
-    return success;
+    return result;
 }
 
 void ResourceEditorDocument::setFilePath(const FilePath &newName)
diff --git a/src/plugins/squish/objectsmapdocument.cpp b/src/plugins/squish/objectsmapdocument.cpp
index 3fb7d9052a7..dfe9b44611e 100644
--- a/src/plugins/squish/objectsmapdocument.cpp
+++ b/src/plugins/squish/objectsmapdocument.cpp
@@ -54,7 +54,7 @@ Result<> ObjectsMapDocument::saveImpl(const FilePath &filePath, bool autoSave)
     return ResultOk;
 }
 
-Utils::FilePath ObjectsMapDocument::fallbackSaveAsPath() const
+FilePath ObjectsMapDocument::fallbackSaveAsPath() const
 {
     return {};
 }
@@ -83,7 +83,7 @@ Result<> ObjectsMapDocument::reload(IDocument::ReloadFlag flag, IDocument::Chang
     return result;
 }
 
-bool ObjectsMapDocument::buildObjectsMapTree(const QByteArray &contents)
+Result<> ObjectsMapDocument::buildObjectsMapTree(const QByteArray &contents)
 {
     QMap<QString, ObjectsMapTreeItem *> itemForName;
 
@@ -97,7 +97,7 @@ bool ObjectsMapDocument::buildObjectsMapTree(const QByteArray &contents)
         const QString objectName = QString::fromUtf8(line.left(tabPosition).trimmed());
         if (!objectName.startsWith(ObjectsMapTreeItem::COLON)) {
             qDeleteAll(itemForName);
-            return false;
+            return ResultError(Tr::tr("Object name does not start with colon"));
         }
 
         ObjectsMapTreeItem *item = new ObjectsMapTreeItem(objectName,
@@ -123,10 +123,10 @@ bool ObjectsMapDocument::buildObjectsMapTree(const QByteArray &contents)
     }
 
     m_contentModel->changeRootItem(root);
-    return true;
+    return ResultOk;
 }
 
-bool ObjectsMapDocument::setContents(const QByteArray &contents)
+Result<> ObjectsMapDocument::setContents(const QByteArray &contents)
 {
     return buildObjectsMapTree(contents);
 }
diff --git a/src/plugins/squish/objectsmapdocument.h b/src/plugins/squish/objectsmapdocument.h
index 6d057b53b94..f9e19e4f63b 100644
--- a/src/plugins/squish/objectsmapdocument.h
+++ b/src/plugins/squish/objectsmapdocument.h
@@ -28,7 +28,7 @@ public:
     Utils::Result<> reload(ReloadFlag flag, ChangeType type) override;
 
     bool shouldAutoSave() const override { return true; }
-    bool setContents(const QByteArray &contents) override;
+    Utils::Result<> setContents(const QByteArray &contents) override;
     QByteArray contents() const override;
     ObjectsMapModel *model() const { return m_contentModel; }
 
@@ -38,7 +38,7 @@ protected:
 private:
     Utils::Result<> openImpl(const Utils::FilePath &fileName,
                              const Utils::FilePath &realFileName);
-    bool buildObjectsMapTree(const QByteArray &contents);
+    Utils::Result<> buildObjectsMapTree(const QByteArray &contents);
     bool writeFile(const Utils::FilePath &fileName) const;
     void syncXMLFromEditor();
 
diff --git a/src/plugins/subversion/subversionsubmiteditor.cpp b/src/plugins/subversion/subversionsubmiteditor.cpp
index b051076c4b7..61e4a5763ea 100644
--- a/src/plugins/subversion/subversionsubmiteditor.cpp
+++ b/src/plugins/subversion/subversionsubmiteditor.cpp
@@ -9,7 +9,9 @@
 #include <vcsbase/submiteditorwidget.h>
 #include <vcsbase/submitfilemodel.h>
 
-using namespace Subversion::Internal;
+using namespace Utils;
+
+namespace Subversion::Internal {
 
 SubversionSubmitEditor::SubversionSubmitEditor() :
     VcsBase::VcsBaseSubmitEditor(new VcsBase::SubmitEditorWidget)
@@ -54,8 +56,10 @@ QByteArray SubversionSubmitEditor::fileContents() const
     return description().toUtf8();
 }
 
-bool SubversionSubmitEditor::setFileContents(const QByteArray &contents)
+Result<> SubversionSubmitEditor::setFileContents(const QByteArray &contents)
 {
     setDescription(QString::fromUtf8(contents));
-    return true;
+    return ResultOk;
 }
+
+} // namespace Subversion::Internal
diff --git a/src/plugins/subversion/subversionsubmiteditor.h b/src/plugins/subversion/subversionsubmiteditor.h
index 9c8e414dec2..8c77020acf0 100644
--- a/src/plugins/subversion/subversionsubmiteditor.h
+++ b/src/plugins/subversion/subversionsubmiteditor.h
@@ -7,8 +7,7 @@
 
 #include <QPair>
 
-namespace Subversion {
-namespace Internal {
+namespace Subversion::Internal {
 
 class SubversionSubmitEditor : public VcsBase::VcsBaseSubmitEditor
 {
@@ -24,8 +23,7 @@ public:
     void setStatusList(const QList<StatusFilePair> &statusOutput);
 
     QByteArray fileContents() const override;
-    bool setFileContents(const QByteArray &contents) override;
+    Utils::Result<> setFileContents(const QByteArray &contents) override;
 };
 
-} // namespace Internal
-} // namespace Subversion
+} // namespace Subversion::Internal
diff --git a/src/plugins/texteditor/textdocument.cpp b/src/plugins/texteditor/textdocument.cpp
index 48ff564ab96..61911fed8af 100644
--- a/src/plugins/texteditor/textdocument.cpp
+++ b/src/plugins/texteditor/textdocument.cpp
@@ -719,7 +719,7 @@ QByteArray TextDocument::contents() const
     return plainText().toUtf8();
 }
 
-bool TextDocument::setContents(const QByteArray &contents)
+Result<> TextDocument::setContents(const QByteArray &contents)
 {
     return setPlainText(QString::fromUtf8(contents));
 }
@@ -860,18 +860,18 @@ Result<> TextDocument::reload(const FilePath &realFilePath)
     return result;
 }
 
-bool TextDocument::setPlainText(const QString &text)
+Result<> TextDocument::setPlainText(const QString &text)
 {
     if (text.size() > EditorManager::maxTextFileSize()) {
         document()->setPlainText(TextEditorWidget::msgTextTooLarge(text.size()));
         d->resetRevisions();
         document()->setModified(false);
-        return false;
+        return ResultError(TextEditorWidget::msgTextTooLarge(text.size()));
     }
     document()->setPlainText(text);
     d->resetRevisions();
     document()->setModified(false);
-    return true;
+    return ResultOk;
 }
 
 Result<> TextDocument::reload(ReloadFlag flag, ChangeType type)
diff --git a/src/plugins/texteditor/textdocument.h b/src/plugins/texteditor/textdocument.h
index 0008935b355..2d6b0d9c556 100644
--- a/src/plugins/texteditor/textdocument.h
+++ b/src/plugins/texteditor/textdocument.h
@@ -102,7 +102,7 @@ public:
 
     // IDocument implementation.
     QByteArray contents() const override;
-    bool setContents(const QByteArray &contents) override;
+    Utils::Result<> setContents(const QByteArray &contents) override;
     void formatContents() override;
     bool shouldAutoSave() const override;
     bool isModified() const override;
@@ -122,7 +122,7 @@ public:
     virtual Utils::Result<> reload();
     Utils::Result<> reload(const Utils::FilePath &realFilePath);
 
-    bool setPlainText(const QString &text);
+    Utils::Result<> setPlainText(const QString &text);
     QTextDocument *document() const;
 
     using SyntaxHighLighterCreator = std::function<SyntaxHighlighter *()>;
diff --git a/src/plugins/vcsbase/submiteditorfile.cpp b/src/plugins/vcsbase/submiteditorfile.cpp
index c7f2acf3863..19904bc1900 100644
--- a/src/plugins/vcsbase/submiteditorfile.cpp
+++ b/src/plugins/vcsbase/submiteditorfile.cpp
@@ -50,7 +50,7 @@ QByteArray SubmitEditorFile::contents() const
     return m_editor->fileContents();
 }
 
-bool SubmitEditorFile::setContents(const QByteArray &contents)
+Result<> SubmitEditorFile::setContents(const QByteArray &contents)
 {
     return m_editor->setFileContents(contents);
 }
diff --git a/src/plugins/vcsbase/submiteditorfile.h b/src/plugins/vcsbase/submiteditorfile.h
index 9ccfe3c16d6..ce1df2fbc4f 100644
--- a/src/plugins/vcsbase/submiteditorfile.h
+++ b/src/plugins/vcsbase/submiteditorfile.h
@@ -21,7 +21,7 @@ public:
                          const Utils::FilePath &realFilePath) override;
 
     QByteArray contents() const override;
-    bool setContents(const QByteArray &contents) override;
+    Utils::Result<> setContents(const QByteArray &contents) override;
 
     bool isModified() const override { return m_modified; }
     ReloadBehavior reloadBehavior(ChangeTrigger state, ChangeType type) const override;
diff --git a/src/plugins/vcsbase/vcsbasesubmiteditor.cpp b/src/plugins/vcsbase/vcsbasesubmiteditor.cpp
index 362c7cb4d4e..a5bab7a7c93 100644
--- a/src/plugins/vcsbase/vcsbasesubmiteditor.cpp
+++ b/src/plugins/vcsbase/vcsbasesubmiteditor.cpp
@@ -397,10 +397,10 @@ QByteArray VcsBaseSubmitEditor::fileContents() const
     return description().toLocal8Bit();
 }
 
-bool VcsBaseSubmitEditor::setFileContents(const QByteArray &contents)
+Result<> VcsBaseSubmitEditor::setFileContents(const QByteArray &contents)
 {
     setDescription(QString::fromUtf8(contents));
-    return true;
+    return ResultOk;
 }
 
 QString VcsBaseSubmitEditor::description() const
diff --git a/src/plugins/vcsbase/vcsbasesubmiteditor.h b/src/plugins/vcsbase/vcsbasesubmiteditor.h
index d9c0f9bf2c3..fb6e31f80c4 100644
--- a/src/plugins/vcsbase/vcsbasesubmiteditor.h
+++ b/src/plugins/vcsbase/vcsbasesubmiteditor.h
@@ -95,7 +95,7 @@ protected:
      * the file. The default implementation uses the text
      * of the description editor. */
     virtual QByteArray fileContents() const;
-    virtual bool setFileContents(const QByteArray &contents);
+    virtual Utils::Result<> setFileContents(const QByteArray &contents);
 
     QString description() const;
     void setDescription(const QString &text);