Release notes for Agda version 2.7.0.1

This is a minor release of Agda fixing some bugs and regressions.

Installation

• During installation, Agda type-checks its built-in modules and installs the generated .agdai files. (This step is now skipped when the Agda executable is not installed, e.g. cabal install --lib Agda.) Should the generation for (some of) these files fail, the names of the missing ones are now printed, but installation continues nevertheless (PR #7465). Rationale: installation of these files is only crucial when installing Agda in super-user mode.

• Agda supports GHC versions 8.6.5 to 9.10.1.

Pragmas and options

• The release notes of 2.7.0 claimed that the option --exact-split was now on by default (Issue #7443). This is actually not the case, the documentation has been suitably reverted.

• Default option --save-metas has been reverted to --no-save-metas because of performance regressions (Issue #7452).

Bug fixes

• Fixed an internal error related to interface files (Issue #7436).

• Fixed two internal errors in Mimer: (Issue #7402 and Issue #7484).

• Fixed a regression causing needless re-checking of files (Issue #7199).

• Improved printing of terms by fixing a display form bug (PR #7480).

List of closed issues

For 2.7.0.1, the following issues were closed (see bug tracker):

• Issue #7199: Agda re-checks a file with an up-to-date interface file
• Issue #7402: Mimer internal error in hole with constraint
• Issue #7436: Code only reachable from display forms not serialised in Agda 2.7.0
• Issue #7442: Regression: emptiness check fails when erased constructors are involved
• Issue #7443: --exact-split is not default in 2.7.0, contrary to claims
• Issue #7452: Performance regression caused by making --save-metas the default
• Issue #7455: Both stack and cabal fail to install Agda
• Issue #7484: Internal error using Mimer in where block

These pull requests were merged for 2.7.0.1:

• PR #7427: #7402: mimer failing on higher order goal
• PR #7444: Fix #7436: make display forms of imported names DeadCode roots
• PR #7445: Remove disclaimer that Agda would not follow the Haskell PVP
• PR #7454: Fixed #7199
• PR #7456: Actually, –exact-split is not really on by default
• PR #7457: Revert default to --no-save-metas
• PR #7465: Re #7455: Setup.hs: catch when Agda did not produce (all) agdai files
• PR #7471: setup: Don’t assume exe is built on –lib
• PR #7475: Hotfix for #7442
• PR #7476: Bump std-lib to latest (v2.1.1) and cubical to latest
• PR #7480: Match display forms in the right context
• PR #7487: Mimer shouldn’t try to use existing pattern lambdas in solutions