Fix newly found issues

spec/ameba/config_spec.cr

@@ -120,7 +120,7 @@ module Ameba
       it "returns list of sources" do
         config.sources.size.should be > 0
         config.sources.first.should be_a Source
-        config.sources.any? { |s| s.fullpath == __FILE__ }.should be_true
+        config.sources.any?(&.fullpath.==(__FILE__)).should be_true
       end
 
       it "returns a list of sources mathing globs" do
@@ -130,7 +130,7 @@ module Ameba
 
       it "returns a lisf of sources excluding 'Excluded'" do
         config.excluded = %w(**/config_spec.cr)
-        config.sources.any? { |s| s.fullpath == __FILE__ }.should be_false
+        config.sources.any?(&.fullpath.==(__FILE__)).should be_false
       end
     end
 

spec/ameba/severity_spec.cr

@@ -4,9 +4,7 @@ module Ameba
   describe Severity do
     describe "#symbol" do
       it "returns the symbol for each severity in the enum" do
-        Severity.values.each do |severity|
+        Severity.values.each(&.symbol.should_not(be_nil))
-          severity.symbol.should_not be_nil
-        end
       end
 
       it "returns symbol for Error" do

src/ameba/ast/scope.cr

@@ -78,7 +78,7 @@ module Ameba::AST
     # scope.find_variable("foo")
     # ```
     def find_variable(name : String)
-      variables.find { |v| v.name == name } || outer_scope.try &.find_variable(name)
+      variables.find(&.name.==(name)) || outer_scope.try &.find_variable(name)
     end
 
     # Creates a new assignment for the variable.

src/ameba/glob_utils.cr

@@ -11,7 +11,7 @@ module Ameba
       rejected = rejected_globs(globs)
       selected = globs - rejected
 
-      expand(selected) - expand(rejected.map! { |p| p[1..-1] })
+      expand(selected) - expand(rejected.map!(&.[1..-1]))
     end
 
     # Expands globs. Globs can point to files or even directories.

src/ameba/runner.cr

@@ -126,7 +126,7 @@ module Ameba
       @sources.all? do |source|
         source.issues
           .reject(&.disabled?)
-          .none? { |issue| issue.rule.severity <= @severity }
+          .none?(&.rule.severity.<=(@severity))
       end
     end